Crossword Genius

Sharpen (4)

Ross

There are a few possibilities for this:

'sharpen' is the definition.
(I know this)

This is the entire clue.

(Other definitions for whet that I've seen before include "Sharpen the blade of (a tool/weapon)" , "Make more acute" , "Sharpen by rubbing" , "Sharpen - stimulate" , "Edge" .)

I've seen this clue in The Wall Street Journal, The Guardian, The Sun, The New York Times, The Independent, the USA Today, The Mirror, the Penny Press, the Evening Standard, the King Feature Syndicate and the Universal.
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