Drinks supplied by ace flying Spitfire (9)
I believe the answer is:
aperitifs
'drinks' is the definition.
(aperitif is a kind of drink)
'supplied by ace flying spitfire' is the wordplay.
'supplied by' means one lot of letters go next to another.
'ace' becomes 'a'.
'flying' indicates anagramming the letters (letters fly around into new positions).
'spitfire' anagrammed gives 'peritifs'.
'a' put next to 'peritifs' is 'APERITIFS'.
(Other definitions for aperitifs that I've seen before include "Starters" , "Pre-dinner drinks" .)