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Small helper of Santa’s picked up, remaining calm? (4-9)

Ross

I believe the answer is:

self-collected

'remaining calm?' is the definition.
(self-collected means calm or composed)

'small helper of santa's picked up' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'helper of santa' becomes 'elf' (Santa's elves).
'picked up' becomes 'collected' ('collect' can be a synonym of 'pick up').
's'+'elf'+'collected'='SELF-COLLECTED'

I've seen this clue in The Times.
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