Nobody imitates a pious woman (4)
I believe the answer is:
none
'nobody' is the definition.
(not a single person)
'imitates a pious woman' is the wordplay.
I cannot really see how this works, but
'a' could be 'one' and 'one' is present in the answer.
A single letter 'n' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for none that I've seen before include "Not a single person" , "Nobody - nothing" , "service for monks" , "office" , "Not any sort of neon" .)