Sour in taste; sharp or forthright in speech or comments (7)

I believe the answer is:

acerbic

(Other definitions for acerbic that I've seen before include "Astringent in tone" , "Bitter-tasting" , "Biting" , "Bitter (in speech)" , "Sour in taste or harsh in tone" .)

I've seen this clue in The Times.

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