Crossword Genius

Sharpness, sourness (7)

Ross

I believe the answer is:

acidity

I believe this clue is a double definition.

'sharpness' is the first definition.
(thesaurus)

'sourness' is the second definition.
(acidity is a kind of sourness)

(Other definitions for acidity that I've seen before include "bite" , "Corrosive quality" , "Sourness, sharpness" , "Sourness (of taste)" , "Sour quality" .)

I've seen this clue in The Times.
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