Crossword Genius

___ acid (wine component) (6)

Ross

I believe the answer is:

tannic

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

I've seen this clue in the Universal and the New York Times.
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