___ acid (compound in red wine) (6)

I believe the answer is:

tannic

(Other definitions for tannic that I've seen before include "Relating to a substance in tea and wine" , "Acid in tea and wine" , "& 14 Across Chemical in e.g. tea" , "Related to compound found in tea, used for dyeing" , "Kind of acid in tea or tree-barks" .)

I've seen this clue in The Washington Post.

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