Crossword Genius

Impulse (4)

Ross

There are a few possibilities for this:

(Another definition for onan that I've seen is " Judah's second son".)

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