Work in church, wearing this? (4)
I believe the answer is:
cope
'wearing this?' is the definition.
The definition suggests a singular noun which matches the answer.
'work in church' is the wordplay.
'work' becomes 'op' (common abbreviation for 'opus').
'in' means one lot of letters goes inside another.
'church' becomes 'CE' (abbreviation for Church of England).
'op' inserted within 'ce' is 'COPE'.
(Other definitions for cope that I've seen before include "Join" , "Firmly based (in)" , "Deal effectively (with a difficulty)" , "Priest's ceremonial cloak" , "special cloak" .)