Repents (6)
I believe the answer is:
atones
'repents' is the definition.
('atone' can be a synonym of 'repent')
This is all the clue.
(Other definitions for atones that I've seen before include "Makes amends for sin" , "Make amends for sin" , "Makes up for injury or offence" , "Makes up for wrong done with a stone" , "Makes up for injury inflicted" .)