They're cossetted in carpet slippers (4)

I believe the answer is:

pets

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'they're cossetted' is the definition.
The definition suggests an adverb but the answer is not.

'in carpet slippers' is the wordplay.
'in' says the answer is hidden in the clue.
'PETS' can be found hidden inside 'carpet slippers'.

Can you help me to learn more?

(Other definitions for pets that I've seen before include "Animals at home" , "Domesticated animals" , "Little darlings - step on them" , "Domestic animals" .)

I've seen this clue in the Evening Standard.

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