Crossword Genius

Sharpen (4)

Ross

There are a few possibilities for this:

'sharpen' is the definition.
(I know that whet is a more specific form of the action sharpen)

This is all the 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 Penny Press, The Wall Street Journal, The Guardian, the Evening Standard, The Sun, the USA Today, the Universal, The Mirror, The New York Times, the King Feature Syndicate, The Independent and the LA Times.
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