Crossword Genius

Red wine astringent (6)

Ross

I believe the answer is:

tannin

(Other definitions for tannin that I've seen before include "Compound from bark or tea, used for dyeing" , "Bitter substance in red wines" , "Vegetable substance used in making wine" , "It occurs in tea and grapes" , "Ingredient of wine" .)

I've seen this clue in the Universal and The Sunday Times.
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