Commune on the Garonne river in Bordeaux, which produces a sweet white wine (6)

I believe the answer is:

barsac

(Other definitions for barsac that I've seen before include "Scarab (anag) - sweet white wine" , "18 [WINE]" , "French wine" , "some from France" , "Sweet Bordeaux wine" .)

I've seen this clue in The Independent.

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