Come back among aircrew, snappily heading west (6)
I believe the answer is:
answer
'come back' is the definition.
(I've seen this in another clue)
'among aircrew snappily heading west' is the wordplay.
'among' indicates a hidden word.
'heading west' shows that the letters should be reversed in order.
'rewsna' can be found hidden inside 'aircrew snappily'.
'rewsna' back-to-front is 'ANSWER'.
(Other definitions for answer that I've seen before include "Retort" , "'Daisy, Daisy, give me your ...... do'" , "Response to a question" , "Reply or solution" , "Acknowledge" .)