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