Perhaps repent? Not this woman (3-5)
I believe the answer is:
she-devil
'perhaps repent? not this' is the definition.
The definition suggests a singular noun which matches the answer.
'woman' is the wordplay.
I cannot quite see how this works, but
'woman' could be 'devi' and 'devi' is found within the answer.
The remaining letters 'shel' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for she-devil that I've seen before include "woman like Lilith" , "Malicious and spiteful woman" .)