Across:
8 Broadcast (sow) curtailed (w) (‘sow’ without ‘w’ = SO-) by medium (-M-) – the greatest (‘the greatest’ = Muhammad Ali = -ALI) (SOMALI) living in Africa (SOMALI),
9 Lovers (lovers) travelling (= anagram indicator) (lovers = OVER-LS) around American city (LA) turning up (= reverse indicator) (LA = -AL-) (OVERALLS) in protective clothing (OVERALLS),
10 Vocal type (ORAL) concealed for a laugh (concealed ‘fOR A Laugh’ = ORAL),
11 It’s common knowledge (OPEN SECRET), Frank (OPEN) has a skeleton in the closet (SECRET) (OPEN SECRET),
12 Place (PL-) for Hugo (Hugo) Boss (= anagram indicator) (Hugo = -OUGH) (PLOUGH) to cultivate (PLOUGH),
14 Rocky (= anagram indicator) O’Neill (O’Neill = LONELI-) is in hospital (-ER) (LONELIER) feeling more isolated (LONELIER),
15 A level of frustration (DISSATISFACTION) is (-IS-) behind (= positional indicator) dispute primarily (‘Dispute’ primarily = -D-) for compensation (-SATISFATION) (DISSATISFATION),
18 Spins (= reverse indicator) records (LPs = (SPL-) for the Christmas season (winter) heading off (w) (‘winter’ without ‘w’ = -INTER) (SPLINTER) with Shatter (shatter/break into bits = SPLINTER),
20 It (it) reflects (= reversal indicator) (it = TI-) political party (Democratic Unionist Party = DUP = -D- UP) seizing last opportunity (last ‘opportunitY’ = -Y) (TIDY UP) to clean the mess in The House (TIDY UP),
22 Attackers (ASSAILANTS) from Rush (rush/attack = ASSAIL-) synonymous with The Hill (-ANTS / anthill) (ASSAILANTS),
24 Passed on (LATE) content from revolutionary (= reverse indicator) walkie-talkies (content from ‘walkiE-TALkies’ = etal = LATE),
25 Plot (BED) to disturb (= anagram indicator) Lenin? (Lenin = LINEN) (BED LINEN) I’d have to sleep on that! (BED LINEN),
26 Refer to (INVOKE) ok vine (ok vine) production (= anagram indicator) (ok vine = INVOKE).
Down:
1 Controversial dropping votes in (‘controversial’ dropping ‘votes in’ = corral = CORRAL) round-up (round-up/gather together = CORRAL),
2 One of those housing the record holders (JAIL) raises (= reverse indicator) some Camellia Japonica (some ‘CamelLIA Japonica’ = liaj = JAIL),
3 Right (R-) choice (choice), wrong (= anagram indicator) (choice = -ICOCHE-) time (-T) (RICOCHET) for one of those on the rebound (RICOCHET),
4 Carry on (carry on/manage = COPE) Constable (COP-) – the last movie (the last ‘moviE’ = -E) (COPE),
5 Reduce (lessen) sound (= homophone indicator) (‘lessen’ = ‘lesson’ = LESSON) for Bible reading (LESSON),
6 Work out (CALCULATE-), starting on dumbbells (starting on ‘Dumbbells’ = -D) (CALCULATED) – it’s how they got the figures? (CALCULATED),
7 One of those in church (altar) report (= homophone indicator) (‘altar’ = ‘ALTER’), for example (e.g. = EG-), going around (-O) (ALTER EGO) with Mr Hyde, for instance (Mr Hyde is Dr Jekyll’s ALTER EGO),
13 It’s not good enough (UNSUITABLE) or satisfactory (-SUITABLE) for organisation (United Nations = UN-) starting off (= position indicator) (UNSUITABLE),
14 Playing (= anagram indicator) roles (roles = LOSER) in local flop (LOSER),
16 Crazy (= anagram indicator) promise (promise = IMPOS-ER) over time (-T-) (IMPOSTER) leads to fraud (IMPOSTER),
17 Creative (ARTISTIC) type from museum (ART-) is (-IS-) getting endless (k) local credit (‘tick’ without ‘k’ = -TIC) (ARTISTIC),
19 Genius (TALENT) produces fair amount of (half of) data (half of ‘daTA’ = TA-) for fast time (-LENT) (TALENT),
21 The process of understanding (UPTAKE) what’s raised (UP-) for Revenue (revenue/income = -TAKE) (UPTAKE),
23 The Three Sisters, perhaps (NUNS), reviewed (= reversal indicator) by leading newsman (leading ‘Newsman’ = -N-) in The Star (sun = NU-S) (NUNS)
24 Charge (LEVY) for getting off flyover (‘for’ getting off ’flyover’ = lyve = LEVY).