Pub's bill for French wine (6)
I believe the answer is:
barsac
'for french wine' is the definition.
(I've seen this before)
'pub's bill' is the wordplay.
'pub's' becomes 'bar's' (both are drinking establishments).
'bill' becomes 'ac' (short for account).
'bars'+'ac'='BARSAC'
(Other definitions for barsac that I've seen before include "Sweet Bordeaux wine" , "French wine" , "Scarab (anag) - sweet white wine" , "some from France" , "18 [WINE]" .)