Nun’s outfit at home (7)

I believe the answer is:

habitat

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'home' is the definition.
(I know that home can be written as habitat)

'nun's outfit at' is the wordplay.
'nun's outfit' becomes 'habit' (I am not sure about this - if you are sure you should believe this answer much more).
'habit'+'at'='HABITAT'

Can you help me to learn more?

(Other definitions for habitat that I've seen before include "Animal's environment" , "Local environment" , "Shop founded by Terence Conran" , "One's normal environment" , "Natural home of wildlife" .)

I've seen this clue in The Mirror.

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