Keenness, sharpness (6)

I believe the answer is:

acuity

This clue is a double definition.

'keenness' is the first definition.
(synonyms)

'sharpness' is the second definition.
(synonyms)

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

I've seen this clue in the Irish Times (Simplex) and The Irish Times.

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