Back talk? (4)

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.

(Other definitions for echo that I've seen before include "Reminder" , "one catches on the rebound?" , "Reflection of sound - Greek nymph" , "Imitate -- a nymph" , "Sound following" .)

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

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