Some important siestas for most restless (8)

I believe the answer is:

antsiest

'most restless' is the definition.
(I've seen this in another clue)

'some important siestas for' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'ANTSIEST' can be found hidden inside 'important siestas for'.

I've seen this clue in the Sydney Morning Herald.

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