Poet, endlessly quiet and mischievous (7)

I believe the answer is:

larkish

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'mischievous' is the definition.
(thesaurus)

'poet endlessly quiet' is the wordplay.
I cannot really see how this works, but
'quiet' could be 'sh' (both can be said to tell someone to be quiet) and 'sh' is found in the answer.
This explanation may well be incorrect...

'and' is the link.

Can you help me to learn more?

I've seen this clue in The Guardian.

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