Crossword Genius

Sounds of disapproval (4)

Ross

I think it could be either:

tuts

tsks

'sounds of disapproval' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Another definition for tuts that I've seen is " Makes disapproving sounds".)

I've seen this clue in the Newsday, the LA Times, the Universal, The Wall Street Journal and The New York Times.
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