Across:
8 It’s a risky business (CASINO) for officer (Commanding Officer = C-O) covering up a (-A-) wrong-doing (-SIN-) (CASINO),
9 Expose the flaw (CATCH OUT) of beach (CATCH) on holiday (OUT) (CATCH OUT),
10 Uplifting (= reversal indicator) part of the hospital faculty (part of the ‘hospiTAL Faculty’ = talf = FLAT) where the nurses might be sharing (FLAT),
11 Find something after casting a wide net (CATCH A FISH) for lead with 15 across (lead with ‘catch one’s breath’ = CATCH) on a (A) bass (FISH) (CATCH A FISH),
12 State that’s barely conscious (STUPOR) of Proust (Proust) novel (= anagram indicator) (Proust = STUPOR),
14 Very strong (CAST IRON) players (CAST) at the club (IRON golf club) (CAST IRON),
15 Pause (CATCH ONE’S BREATH) opening 9 across (opening ‘catch out’ = CATCH) for individuals (ones = ONE’S) you’re likely to see on a cold day (see BREATH on a cold day) (CATCH ONE’S BREATH),
18 Off (= anagram indicator) the plane (the plane = ELEPHANT) – it’s a Jumbo (jumbo ELEPHANT),
20 It’s miles away perhaps (ABSENT) from baked (= anagram indicator) beans (beans = ABSEN-) on top of toast (top of ‘Toast’ = -T) (ABSENT),
22 Introducing 15 across (introducing ‘catch one’s breath = CATCH-) for populist (-IN-) Government (-G) to broadcast (ON) (CATCHING ON) is becoming more popular (CATCHING ON),
24 Sides for Feast at Swan Goose Gate (sides for ‘FEast at swan goose gaTE’ = FETE) fundraiser (FETE),
25 Join the choir (sing = S-ING) embracing church (-CH-) leaders every Monday (leaders ‘Every Monday’ = -EM-) (SCHEMING) planning in secret (SCHEMING),
26 Farcical (ABSURD) advertisement (ad = A-D) about empty (u) transport (‘bus’ without ‘u’= -BS-) going to old city (-UR-) (ABSURD).
Down:
1 No rest in Wall Street (no ‘rest’ in ‘Wall Street’ = wallet = WALLET) for one holding onto the cash (WALLET),
2 Shady type (TINT) in Bray comes from Brittany (‘Bray’ comes from ‘Brittany’ = ittn = TINT),
3 Show (CONCERT-) nothing (-O) (CONCERTO) of musical composition (CONCERTO),
4 Production (= anagram indicator) cost (cost = SCOT) of character on Shetland, for instance (SCOT),
5 Irritations (ITCHES) in unorthodox (= anagram indicator) ethics (ethics = ITCHES),
6 Constantly sidestepping (SHIFTINESS) Stein’s fish (Stein’s fish) dish (= anagram indicator) (Stein’s fish = SHIFTINESS),
7 A bridge (abridge = CUT SHORT) in Trim (CUT) that is not high enough (SHORT) (CUT SHORT),
13 One of those working with Fagin (PICKPOCKET) – a type of fence (picket = PICK-ET) getting to grips with policeman (cop) setting up (= reverse indicator) (cop = -POC-) extreme kleptomaniac (extreme ‘Kleptomaniac’ = -K-) (PICKPOCKET),
14 A gent (agent = -REP-) in court (ct = C-T) (CREPT) made little headway with the movement (CREPT),
16 Russell (George William Russell = AE = A-E) protects lines (-LL-) to one (-I-) party (African National Congress = -ANC-) (ALLIANCE) in coalition (ALLIANCE),
17 Every six months (BIANNUAL), bank (AIB) does a review (= reversal indicator) (AIB = BIA-) to start off (a) year (‘annual’ without ‘a’ -NNUAL) (BIANNUAL),
19 Is bitter (ACIDIC) with accountant (CA) over (= reverse indicator) (CA = AC-) the papers (-ID- papers) getting one (-I-) caught (-C) (ACIDIC),
21 In essence (NATURE), the banks’ national treasure (the banks ‘NATional treasURE’ = NATURE),
23 For the players (GIGS), there is no reason in aggression (no ‘reason’ in ‘aggression’ = ggsi = GIGS),
24 Drop a line (FISH) at the end of 11 across (at the end of ‘catch a fish’ = FISH).