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