Syllable of disapproval (3)

I think it could be either:

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tsk

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

This is all the clue.

(Other definitions for tut that I've seen before include "Express disapproval" , "Disapproving comment" , "Annoyed exclamation" , "in short I don't like that!" , "Sound of mild disapproval" .)

I've seen this clue in the Universal and The New York Times.

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