Crossword Genius

Sharpness of thought (6)

Ross

I believe the answer is:

acuity

(Other definitions for acuity that I've seen before include "Sharpness of vision or a quick intelligence" , "Keenness of perception" , "Sharp-sightedness, keenness" , "Sharpness of mind, keenness" , "Quick and penetrating intelligence" .)

I've seen this clue in The Times.
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