Crossword Genius

Back talk? (4)

Ross

I think it could be either:

sass

echo

'back talk' is the definition.
(I've seen this in another clue)

This is all the clue.

(Another definition for sass that I've seen is " Cheek".)

I've seen this clue in the USA Today, the Penny Press, The New York Times, the King Feature Syndicate, The Washington Post, The Star Tribune, The Wall Street Journal, the Universal, the Newsday and the LA Times.
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