Crossword Genius

Make sharper (4)

Ross

I believe the answer is:

'make sharper' is the definition.
(honing is a kind of making sharper)

This is all the clue.

(Other definitions for hone that I've seen before include "Sharpen tool on stone" , "Polish" , "Smooth stone" , "Strop" , "Sharpen (a blade)" .)

I've seen this clue in The Wall Street Journal, The Mirror, the Newsday and the USA Today.
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