Across:
1 It’s produced in the cooking room (FOOD) by doctoring drugs (POISONING) (FOOD POISONING) and it’ll make one sick to one’s stomach (FOOD POISONING),
10 Plain to see (OVER-T) around East half (‘East’ half = -EA-) (OVEREAT) of gorge (OVEREAT),
11 Small piece (B-IT-) about old city (-UR-) recipe (-R-) for duck (-O) (BURRITO) dish popular with those who like meaty pancake (BURRITO),
12 Override a decision in part (‘override a decision’ in part = DEAD) that’s not working (DEAD),
13 Cut up (DICED) by mate left medicated (‘mate’ left ‘medicated’ = edicd = DICED),
15 Popular sides today (FOOD on sides of today’s grid) in the restaurant (FOOD),
17 Allow (LET) son to get out of Solent (‘son’ to get out of ‘Solent’= let = LET),
19 What you might do with 15 across to give everyone a share (RATION ‘food’) of allotment (RATION),
21 Contradict (BELIE-) key (music key -F) (BELIEF) judgement (BELIEF),
22 Disapproval (TU-T-) over institute (-I-) holding onto a small charge (-ION) (TUITION) from fees for coaching clients (TUITION),
23 Portion of the lamb (CUTLET) graze (graze/wound = CUT-) at 17 across (‘let’ = -LET) (CUTLET),
25 Spread the good news (PREACH) in cheap (cheap = P-EACH) complex (= anagram indicator) around river (-R-) (PREACH),
27 Fragment of YouTube directed (fragment of ‘YouTube directed’ = BED) by retiring type (BED),
29 Dealt (SOLD) LSD (LSD = S-LD) staggering (= anagram indicator) around job centre (‘job’ centre = -O-) (SOLD),
30 Similar type in 31 across, for instance (AUDIO = similar to ‘song’), is sound (AUDIO),
31 Relative (SON-) is good (-G) (SONG) dance partner (SONG and dance),
34 Party (do = OD-) upset (= reversal indicator) by referendum option (‘yes’ = -Y-), and endless (end ‘less’ = -S-) switching? (= reversal indicator) Yes (yes = -SEY) (ODYSSEY), it’s a long journey! (ODYSSEY),
35 Not best pleased (ANNOYED) in anodyne (anodyne = ANNOYED) play (= anagram indicator),
36 After (= positional indicator) criminal (= anagram indicator) advised it (advised it = ADDITIVES) (FOOD ADDITIVES), rations (FOOD) what’s needed to make the bread last longer (FOOD ADDITIVES).
Down:
2 Exaggerate (OVERACT) what’s noticeable (OVER-T) about American (-A-) College (-C-) (OVERACT),
3 Lighten up perhaps (DIET) and take the figs out of digestif (take the “figs” out of “digestif” = diet = DIET),
4 Take the top off (f) common meadow grass (foxtail) (‘foxtail’ without ‘f’ = OXTAIL) for the soup (OXTAIL),
5 Subtle (subtle = SUBLET) change? (= anagram indicator) Pass it on again in a homely way! (SUBLET),
6 Concealed by governor mandated (concealed by ‘governor mandated’ = NORM) by convention (NORM),
7 Broadcast (-AIR-) flower (flower/river -OB-) in Ulster (N-I) (NAIROBI) from the green city in the sun (NAIROBI known as “The Green City in the Sun”),
8 The digestive system (FOOD PROCESSOR) of kitchen helper (FOOD PROCESSOR),
9 Heavenly cuisine (FOOD OF THE GODS) prepared by Aengus and áine upstairs (Aengus and áine = gods of Tuatha Dé Danann = FOOD OF THE GODS).
14 Writing (from the 3Rs = -R-) in decent (decent = CENT-ED) novel (= anagram indicator) (CENTRED) is sort of middle of the road (CENTRED),
16 At the most, take hats off (‘at the most’ without ‘hats’ = temot = TOTEM) pole (TOTEM),
18 Type (GENRE) of green (green = GENRE) butcher (= anagram indicator),
20 Some micronutrients (some ‘micronutrients’ = NUT) from Brazil (Brazil NUT),
21 Use this to jazz up proceedings (BOP) with belly of pork starters (‘belly of pork’ starters = BOP),
24 Hot (hot = T-HO) shot (= anagram indicator) overshadows friend (-ALLY-) (= TALLY-HO) heard going hunting (TALLY-HO),
26 Locate (locate = ACOL-TE) Dicky (= anagram indicator) around yard (-Y-) (ACOLYTE) helping father (ACOLYTE)
27 You’d be (you’d be = BUOYED) wrong (= anagram indicator) to be lifted by this (BUOYED),
28 Looking back (= reversal indicator), one (-I) law (law = -WAL) for the papers (ID = DI-) (DIWALI) celebrated in India (DIWALI festival),
32 Employed (USED) tip to get out of dispute (‘tip’ to get out of ‘dispute’ = dsue = USED),
33 Opposed (ANTI) to characters in Constantinople (to characters in ‘Constantinople’ = ANTI).