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 Wall Street Journal, the LA Times, The Sunday Times, The Guardian, the Sydney Morning Herald, The Star Tribune, The Mirror, the Evening Standard, the USA Today, the Penny Press, the Newsday.com and The Telegraph.
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