Crossword Genius

State of being shut up? (7)

Ross

I believe the answer is:

silence

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'state' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'being shut up?' is the second definition.
(I've seen this in another clue)

'of' is the link.

Can you help me to learn more?

(Other definitions for silence that I've seen before include "Secrecy; stillness" , "Quietude" , "License (anag)" , "may be required in court" , "Noiselessness" .)

I've seen this clue in the Evening Standard.
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