A little noise due to something being wrong (3)

I believe the answer is:

tut

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'a little noise' is the definition.
'tut' can be an answer for 'noise' (I have seen 'Disapproving noise ' mean 'tut' so perhaps 'noise' could also mean 'tut'). I'm not sure about the 'a little' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for tut that I've seen before include "Show disapproval" , "Expression of disapproval, usually doubled" , "Express impatience" , "Express disapproval" , "Sound disapproving" .)

I've seen this clue in the Evening Standard.

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