Across:
1 Run a risk (GAMBLE) with a feature of the roof (GA-BLE) around back of the stadium (back of ‘stadium’ = -M-) (GAMBLE),
4 Grounds (STADIUMS) for all the characters upsetting (= reverse all indicator) development authority (IDA= -ADI-) consumed by lewd material (smut = T-UMS) that’s endless (end ‘less’ = S-) (STADIUMS),
9 Travel agencies lacking creative (‘travel agencies’ lacking ‘creative’ = lagnes = ANGELS) heavenly figures? God knows! (ANGELS),
10 Mighty (SMASHING) craic (‘craic’ = ‘crack’ = SMASH-) overheard (= homophone indicator) in (-IN-) Government (-G) (SMASHING),
12 You can see this from the top of the ship (DECK CARGO) in knockout local (local ‘knockout’ = DECK) runabout (CAR-) that’s fairly (half of) good (half of ‘good’ = -GO) (DECK CARGO),
13 Race (EVENT) of sailor isn’t part of revelations (‘sailor’ isn’t part of ‘revelations’ = evetn = EVENT),
14 This is so obvious (DEAD GIVEAWAY) to Will? (will = DEAD GIVEAWAY),
18 Is not working (DEAD-) with Grace (poise), for the most part (‘poise’ for the most part = POIS-), in Lyon? (Lyon = LY -ON) (DEADLY POISON) Those on Death Row will get this! (DEADLY POISON),
21 Part of Malaga invokes (part of ‘Malaga invokes’ = AGAIN) another time (AGAIN),
22 Local thug (goon = GO ON) gets permission (LEAVE) (GO ON LEAVE) to get time off (GO ON LEAVE),
24 Numbed (DEADENED) 25 across (‘deaden’ = DEADEN-) with a fair amount of (half of) weed (half of ‘weed’ = -ED) (DEADENED),
25 Gandhi isn’t part of hidden agenda (‘Gandhi’ isn’t part of ‘hidden agenda’ = deenda = DEADEN) that’s dull (DEADEN),
26 No life (DEADNESS) in half of 24 across (half of ‘deadened’ = DEAD-) and most of the catch (most of the ‘net’ = -NE-) on boat (-SS) (DEADNESS),
27 It would be obscene to not have them for the team photographs (SHORTS) or films (SHORTS).
Down:
1 Money (GRAND-) in a number of families (-DADS) (GRANDDADS) provided by senior clan members (GRANDDADS),
2 Crazy (= anagram indicator) maniac (maniac = MA-CIAN) entertains soldier (-GI-) (MAGICIAN) by pulling rabbits out of a hat (MAGICIAN),
3 Sample of vermicelli lacks (sample of ‘vermicelli lacks’ = LILAC) something fragrant from the olive family (LILAC),
5 The Post (JOB) portray me (portray me = TEMPORARY) badly (= anagram indicator) from the start (= positional indicator) (TEMPORARY JOB) as the caretaker (TEMPORARY JOB),
6 Padre does (Padre does = DESPERADO) badly (= anagram indicator) with reckless villain (DESPERADO),
7 Uninhibited extremes (‘uninhibited’ extremes = UNITED) one associates with being integrated (UNITED),
8 Attractive types (SIGHTS) on top of the arms (SIGHTS on top of the arms/guns),
11 Serious (GRAVE-) machinery on the farm (-DIGGERS) (GRAVEDIGGERS) put to work in the dead centre of Glasnevin (GRAVEDIGGERS),
15 French runner (French runner bean = GREEN BEAN) is naive (GREEN) taking sides with Belgian (taking sides with ‘Belgian’ = BEAN) (GREEN BEAN),
16 Charles Dickens checks out (‘Charles Dickens’ ‘checks’ out/without ‘checks’ = arsdicen = ISLANDER) character synonymous with Christmas, for example? (character synonymous with Christmas Island = ISLANDER),
17 Reads between the lines (INFER-S) about new (-N-) love (-O-) (INFERNOS) for hellish places (INFERNOS),
19 Frank (CANDID) and Rex not in card index (‘Rex’ not in ‘card index’ = cadind = CANDID),
20 In retrospect (= reversal indicator), it’s a pity (alas = -SALA) Dawn (morning = am = MA-) (MASALA) produced something spicy (MASALA),
23 Freeloader (LEECH) on the back foot (heel = LEE-H) over returning (= reversal indicator) conservative (-C-) (LEECH).