Sense of unease when daughter isn't making any noise (8)

I believe the answer is:

disquiet

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'sense of unease' is the definition.
'disquiet' can be an answer for 'unease' (synonyms). I am not certain of the 'sense of' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for disquiet that I've seen before include "Uneasiness" , "Vague unease, anxiety" , "Restlessness" , "Mild anxiety" , "concern" .)

I've seen this clue in The Irish Times.

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