Across:
1 Search party loses chaps (‘search party’ losing ‘chaps’ = erarty = ARTERY) – your heart would go out to one of them (ARTERY),
4 Hides (OBSCURES) half of Jacob’s (half of ‘Jacobs’ = OBS-) smokes (-CURES) (OBSCURES),
9 Upshot (RESULT) of cup falling off sculpture (‘cup’ falling off ‘sculpture’ = slture = RESULT),
10 In a manner of speaking, hasn’t been heard in Rome for a long time (OLD LATIN) and past one’s prime (OLD) in South America (LATIN America) (OLD LATIN),
12 Step in (INTERVENE) for referee (INTERVENE),
13 I dare say, Ray is missing (‘I dare say’ Ray is missing / without ‘Ray’ = idesa = ASIDE) for a comment on the stage (ASIDE),
14 Awkward (EMBARRASSING) shame (EMBARRASS-) in (-IN-) Government (-G) (EMBARRASSING),
18 Where one answers the call (TELEPHONE BOX) in Ring (TELEPHONE) to fight (BOX) (TELEPHONE BOX),
21 How can it be gas (INERT gas) if there’s no sign of life? (INERT),
22 Answer (A-) comes from shady type (-T ONE) getting prison term (TIME) (AT ONE TIME) for something previously (AT ONE TIME),
24 They hide what’s really happening (COVER-UPS) from mugs (C-UPS) boxing – it’s no longer on (-OVER-) (COVER-UPS),
25 Don to take a dip (don/put on BIKINI to take a dip/swim) in top beach (top ‘beach’ = B-) near Island (-I-) Family (-KIN-) Holiday Centre (‘holiday centre’ = -I-) (BIKINI),
26 The dregs (RESIDUES) from revolutionary (= anagram indicator) red issue (red issue = RESIDUES),
27 Some Tennessean celebrity (some ‘Tennessean celebrity’ = SEANCE) sits around a table calling for spirits (SEANCE).
Down:
1 First class (AI-) beer behind (‘beer’ behind = -R-) bar (-LINE-) has recipe (-R) (AIRLINER) that gives people a lift – a high one! (AIRLINER),
2 Examine (TEST) public transport overseas (TUBE) (TEST TUBE) from the laboratory (TEST TUBE),
3 Has the measure of most things (RULER) in the castle (RULER),
5 Left (-L-) the French (the = -LE-) in club (BA-T) providing work for teachers (SCHOOL) (BALLET SCHOOL) educating dancers to stay on their toes (BALLET SCHOOL),
6 One of those from Irish kitchen (COLCANNON) in the army (colonel = COL) is likely to be fired (-CANNON) (COLCANNON),
7 Keep to yourself (RETAIN) going in and out of retail chain (going in and out of ‘retail chain’ = RETAIN),
8 Blow the whistle on someone locally (locally to ‘blow the whistle’/tell = SING-) in hospital (-ER) (SINGER) working in theatre (SINGER),
11 What a role model would do (SET AN EXAMPLE) for Irishman (Sean = SE- AN) over time (-T), for instance (for EXAMPLE) (SET AN EXAMPLE),
15 Came back (RE-ENTERED) with second draft (second letter of ‘draft’ = R-) – it’s key (music key -E-) to play’s direction (-ENTER-) by writer (editor = -ED) (RE-ENTERED),
16 Orchestral leader (O-) produces bass (-B-) violin (violin = -LIVION) movement (= anagram indicator) (OBLIVION) from forgotten state (OBLIVION),
17 Hurry through (EXPEDITE) exercise (-PE-) for director (-D-) in Gate (EX-IT-) finale – it’s the ultimate (‘finale’ it’s the ultimate/last one = -E) (EXPEDITE),
19 Chops up the material (MINCER) in hay coming out of machinery (‘hay’ coming out of ‘machinery’ = mciner = MINCER),
20 In my book (LEAVES), the forecasters will read something into these (the forecasters/fortune-tellers will read something into these = LEAVES),
23 No barns in East Berlin (no ‘barns’ in ‘East Berlin’ = eteli = ELITE) for the cream (ELITE).