Crossword Genius

Bitter and sharp (5)

Ross

I believe the answer is:

acrid

(Other definitions for acrid that I've seen before include "Having a bitter smell or taste" , "Unpleasantly pungent" , "Having a bitter taste or small, like smoke" , "Bitterly pungent" , "Painfully pungent" .)

I've seen this clue in The Guardian.
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