Religious woman not affected by revolution (3)
I believe the answer is:
'religious woman' is the definition.
(woman who has taken religious vows)
'not affected by revolution' is the wordplay.
I cannot quite understand how this works, but
'not' could be 'un' (prefix meaning 'not') and 'un' is present in the answer.
A single letter 'n' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for nun that I've seen before include "One who's taken vows" , "Religious sister" , "Convent resident" , "Woman respecting order" , "A palindromic lady in religious order" .)