Crossword Genius

Sour or bitter in taste or tone (7)

Ross

I believe the answer is:

acerbic

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

I've seen this clue in The Irish Times.
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