Across:
1 Legendary (FAMOUS) couple of leaders of fascist movement usurped? (couple of leaders of ‘FAscist MOvement USurped’ = FAMOUS),
4 Stood up and was counted (SPOKE OUT) in school (S-) for stab (-POKE) at what’s common knowledge (OUT) (SPOKE OUT),
9 Sacramento disregards scam? (‘sacramento’ disregards ‘scam’ = raento = ORNATE) Fancy that! (ORNATE),
10 Produced a type of film (ANIMATED) clip (l) of Bambi (‘animal’ without ‘l’ = ANIMA-) with the (the) heartless (h) (‘the’ without ‘h’ = -TE-) director (-D) (ANIMATED),
12 Irishman (PAT-), and Oriental (East = -E-) writing (from the 3Rs = -R-) tiny (tiny = -NITY) play (= anagram indicator) (PATERNITY) produced The Name of the Father (PATERNITY),
13 Sounds like something barman might ask (USUAL) regular? (USUAL?),
14 One of The Greens giving the go-ahead (TRAFFIC LIGHT), as the amount of vehicles on the road (TRAFFIC) isn’t heavy (LIGHT) (TRAFFIC LIGHT),
18 What the whistleblower is capable of (DENUNCIATION) is informing (DENUNCIATION),
21 Central to committee thinking (central to ‘commitTEE THinking’ = TEETH) these are important to the consumers (TEETH),
22 The director’s handling of the play (TREATMENT) performed in The Theatre (TREATMENT in hospital theatre),
24 Drunk (= anagram indicator) vintner (vintner = INVENT-R) swallows nothing (-O-) (INVENTOR) produced by pioneer? (INVENTOR),
25 Shoot (shoot = S-OOTH) adaptation (= anagram indicator) around Malin Head (‘Malin’ head = -M-) (SMOOTH), as it’s as flat as a pancake (SMOOTH),
26 One of those getting out of Dodge (MOTORIST) is at the mercy of 14 across (MOTORIST is at the mercy of ‘traffic light’),
27 Large (L-) duck (-O-) shot (= anagram indicator) dead (dead = -ADED) (LOADED) and stuffed (LOADED).
Down:
1 A course (FOOTPATH) of primarily freshly (primarily ‘Freshly’ = F-) baked (= anagram indicator) potato (potato = -OOTPAT-) on top of ham (top of ‘Ham’ = -H) (FOOTPATH),
2 I’m (im = MI-) backing (= reversal indicator) Auntie (auntie) arranging (= anagram indicator) (auntie = -NUTIAE) (MINUTIAE) the finer points (MINUTIAE),
3 Say a few words (UTTER) to The Weather Channel (gutter) that needs no introduction (g) (‘gutter’ without ‘g’ = UTTER),
5 Describes miserable type (PENNY-PINCHER) having hand in the English till? (PENNY-PINCHER),
6 Cabling coming out of Buckingham Palace (‘cabling’ coming out of ‘Buckingham Palace’ = ukhmpaace = KAMPUCHEA) and from old part of Asia (KAMPUCHEA now Cambodia),
7 In France where (French ‘where’ = OU-) time (-T-) and place (-PUT) (OUTPUT) is a measurement of one’s economic value (OUTPUT),
8 Ramble (TODDLE) on foot (TO-E) covering Dublin (-D-) to Donegal (-DL-) (TODDLE),
11 Ill-mannered (DISCOURTEOUS) detective (Detective Sergeant = D-S-) imprisons one (-I-) polite type (-COURTEOUS) (DISCOURTEOUS),
15 Having more leeway (freer = FRE-ER) welcoming that woman (-SHE-) with new (-N-) (FRESHENER) product that will clear the air (FRESHENER),
16 Irishmen (Irish ‘men’ = FIR-) going to England (-E-) would (‘would’ = ‘wood’ = -WOOD) say (= homophone indicator) (FIREWOOD) this is similar to Tinder (FIREWOOD),
17 Carried off local (carried off ‘local’ = SNATCHED) chest and (chest and) collection (= anagram indicator) (chest and = SNATCHED),
19 Find it in one’s heart (ATRIUM heart cavity) to answer (A-) upstart (‘Up’ start = -U-) in Meath town (-TRI-M) (ATRIUM),
20 Victor (V-) is an old hand (veteran = -VET) behind (= position indicator) the foreign (the = -EL-) (VELVET) type of revolution (VELVET revolution),
23 Metropolitan ignores trial on (‘metropolitan’ ignores ‘trial on’ = metop = TEMPO) speed (TEMPO).