White wine cocktail (3)
I believe the answer is:
kir
'white wine cocktail' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for kir that I've seen before include "White wine with blackcurrant syrup" , "Blackcurrant drink" , "One that's drunk" , "Cassis-flavoured wine" , "Cocktail" .)