Punishment for religious wrongdoing (7)
I believe the answer is:
penance
'punishment for religious wrongdoing' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for penance that I've seen before include "Expression of sorrow for sin" , "Punishment inflicted on oneself" , "Remorse" , "Punishment for wrongdoing, by religion perhaps" , "act of self-punishment" .)