Across:
1 Caesar’s (SALADS) small country of African (SA-) youths? (-LADS) (SALADS),
4 Kept an eye on (OBSERVED) awful (= anagram indicator) bedsore (bedsore = OBSER-ED) trapping opening for vein (opening for ‘vein’ = -V-) (OBSERVED),
9 Stay behind (REMAIN) for marine (marine = REMAIN) tour (= anagram indicator),
10 Most of (t) the component (‘part’ without ‘t’ = PAR-) from Oxford (-O-) stops working (-DIES) (PARODIES) with apes (apes/skits = PARODIES),
12 Cover job (PLASTER-) for journalist (-ED) (PLASTERED) under the influence? (drunk = PLASTERED),
13 There’s no air in Emirates (there’s no ‘air’ in ‘Emirates’ = emtes = MEETS) for track events (MEETS),
14 Internet’s era (internet’s era = ENTERTAINERS) designed (= anagram indicator) by a number of those putting on an act (ENTERTAINERS),
18 Irish (RACE) bar (OBSTACLE) opens (= positional indicator) (OBSTACLE RACE) – one would think that would be difficult to run? (OBSTACLE RACE),
21 Sounds like something barman might ask (USUAL) regular? (USUAL?),
22 Criticised (TORE APART), as there’s nothing (-O-) to obtain (-RE AP-) in small pie (T-ART) (TORE APART),
24 Come to terms with (COTTON ON) college (C-) having a popular name in Germany (-OTTO-) for French negativity (French ‘no’ = ‘non’ = -N ON) (COTTON ON),
25 Is (-IS-) part of the inner circle? (ring = R-ING) (RISING) That’s revolting! (RISING),
26 Under pressure (STRESSED) to reorder (= anagram indicator) dresses (dresses = S-RESSED) over time (-T-) (STRESSED),
27 Madeleine dismisses lie (‘Madeleine’ dismisses ‘lie’ = madene = DEMEAN) as put down (DEMEAN).
Down:
1 Swinging back around (= reversal indicator), photographic device (lens = S- NEL) captures bang (bang/thump = -RAP-) and hot (-H-) (SHRAPNEL) fragments from bombshell (SHRAPNEL),
2 Give a dressing down to (LAMBASTE) one of the flock (LAMB-) losing the head (m) with The Teacher (‘master’ without ‘m’= -ASTE) (LAMBASTE),
3 Wander (DRIFT) from Dublin (D-) to Split (split = -RIFT) (DRIFT),
5 Getting on (BOARDING) with The Queen (‘the queen’ playing CARD) (BOARDING CARD) – it’s what flighty types at The Gate ask for (BOARDING CARD),
6 Concerned with net sales (net/web sales = E-COMMERCE) of drugs sold online perhaps? (E-COMMERCE),
7 States (states = VOICES) where there’s nothing (-O-) in crime and corruption (V-ICES) (VOICES),
8 Is there no wine in West Indies? (no ‘wine’ in ‘West Indies’ = stdies = DESIST) Give up! (DESIST),
11 Employed by swimmer (BREASTSTROKE) in part of Turkey? (BREAST) That’s what one of the swinger’s is capable of! (golf STROKE) (BREASTSTROKE),
15 Socialise (RUB ELBOWS) in Polish (polish/shine = RUB) joints (ELBOWS) (RUB ELBOWS),
16 For those looking for the ammunition to shoot off about everything (military arms store = MAGAZINE) in Jane’s Defence Weekly (MAGAZINE),
17 Figure (PENTAGON) writer (PEN-) is game (-TAG-) for broadcast (-ON) (PENTAGON),
19 The corner boys (DUNCES) presumably don’t have their thinking caps on (DUNCES),
20 Spread (BUTTER) of British (B-) state (-UTTER) (BUTTER),
23 Light-footed (AGILE) barman (Attorney General = AG-) loses head (f) in row (row/line = ‘file’ without ‘f’ = -ILE) (AGILE).