Perceptiveness (6)

I believe the answer is:

acuity

'perceptiveness' is the definition.
(thesaurus)

This is all the clue.

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

I've seen this clue in the LA Times.

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