It it held by those required to be silent (6)

I believe the answer is:

whisht

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'it it' is the definition.
I know nothing about this answer so I can't judge whether this works.

'held by those required to be silent' is the wordplay.
'held by' means one lot of letters goes inside another.
'those required' becomes 'whit' (I can't explain this - if you can you should give a lot more credence to this answer).
'to be silent' becomes 'sh'.
'whit' going around 'sh' is 'WHISHT'.

Can you help me to learn more?

(Another definition for whisht that I've seen is " Quiet".)

I've seen this clue in The Irish Times.

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