Kir liqueur (6)

I believe the answer is:

cassis

(Other definitions for cassis that I've seen before include "Syrupy blackcurrant drink or flavouring" , "French blackcurrant mixer" , "Blackcurrant cordial" , "syrup drink" , "Liqueur made with blackcurrants" .)

I've seen this clue in the LA Times.

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