Live wearing nun’s costume? (7)
I believe the answer is:
inhabit
'live' is the definition.
(I know that live can be written as inhabit)
'wearing nun's costume?' is the wordplay.
'wearing' becomes 'in' (in jeans or in a dress).
'nun's costume?' becomes 'habit' (I can't justify this - if you can you should give a lot more credence to this answer).
'in'+'habit'='INHABIT'
Can you help me to learn more?
(Other definitions for inhabit that I've seen before include "Tenant" , "Occupy - settle" , "Occupy (dwelling)" , "Live in, occupy" , "Live in (a place)" .)