6  Write "Elgar", as I might do function for The Listener  (4)

 7  Cheek's needing vital hot air (8)

 9/13        X so 15, comedian gives edge to very poor shag? (4,4,5,4)

10 Who's in charge of the Automobile Club? (6)

12 Having received help to sort out compiler getting 50% off, thanks Manhattan hotel (3,5)

14 Officially got together over deposit (3)

16 X so 15, suddenly biting head off? (7)

17 A deck operative, note, limits our stay (7)

19 And this, as "handbags" got out of control?  (3)

21 See 5 Down

24 Punch atheist in "God" parades (6)

25 See 11 Down

27 Advisably, source and spring do have good intentions (4,4)

28 Pop bothers to make the return journey (4)

 2  X so 15, discussing what flavours beer? (2,3,3)

 3  Bad 6 typifying hen night? (4)

 4  Dad carrying large (and mum carrying small) percentage of blood (6)

 5/21        X so 15, bum, bum Shed clue? (6,8)

 8  X so 15, having been dealt no spades or clubs? (3-6)

11/25       Incongruously wreathed in red, led out one of X's predecessors (6,3,5)

13 See 9 Across

15 Might batter be this 5 about anything? (6)

18 Picaresque fellow's glow cast over Scots maid (3-5)

20 Watch horse in pursuit of fox (6)

22 Friendly greeting checked on the way to join us? (6)

23 Familiarly for 11, an all-in-one companion in early life (5)

26 Evasive court painter's added a couple of strokes up top (4)