Crossword Genius

Sour-tasting substance (4)

Ross

I believe the answer is:

acid

'sour-tasting substance' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for acid that I've seen before include "Corrosive substance" , "Sour - LSD" , "Bitter or sour" , "Bitter; biting" , "Sour to the taste" .)

I've seen this clue in The Mirror.
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