White wine and cassis (3)
I believe the answer is:
kir
'white wine and cassis' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for kir that I've seen before include "White wine with blackcurrant syrup" , "Blackcurrant drink" , "One that's drunk" , "Mixture of white wine and cassis" , "Drink of white wine and cassis" .)