It may be balsamic (7)

I believe the answer is:

vinegar

(Other definitions for vinegar that I've seen before include "Condiment - bad temper" , "Sour-tasting liquid as condiment" , "Sour stuff" , "Liquid used as condiment or food preservative" , "Acidic condiment" .)

I've seen this clue in the King Feature Syndicate.

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