Crossword Genius

Make sharper (4)

Ross

I believe the answer is:

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">make sharper</span>' is the definition.<br/ ><span class="explanation-format__explanation">(honing is a kind of making sharper)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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 USA Today, The Mirror, the Newsday and The Wall Street Journal.
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