Crossword Genius

Impulse (4)

Ross

There are a few possibilities for this:

'impulse' is the definition.
(I know that impulse can be written as whim)

This is all the clue.

(Other definitions for whim that I've seen before include "Fanciful idea" , "Fancy, notion" , "Sudden impulse" , "Urge" , "Fad" .)

I've seen this clue in the Evening Standard, the LA Times, The Mirror, the USA Today, The Star Tribune, The Telegraph, the Newsday.com, The Guardian, the Penny Press, the Sydney Morning Herald, The Sunday Times and The Wall Street Journal.
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