Crossword Genius

Improves, as a skill (5)

Ross

I believe the answer is:

hones

(Other definitions for hones that I've seen before include "Perfects, sharpens" , "gets sharp" , "Sharpens on strap, say razor" , "Sharpens, like knife on stone" , "Sharpens as on whetstone" .)

I've seen this clue in The Washington Post and The New York Times.
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