Crossword Genius

(Mental) sharpness (6)

Ross

I believe the answer is:

acuity

'mental sharpness' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for acuity that I've seen before include "Sharpness of vision or a quick intelligence" , "Showing ingenuity" , "Keenness of perception" , "Keenness of vision" , "Mental sharpness" .)

I've seen this clue in The Guardian.
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