Repented (6)
I believe the answer is:
atoned
'repented' is the definition.
('atone' can be a synonym of 'repent')
This is the entire clue.
(Other definitions for atoned that I've seen before include "Donate (anag)" , "Made reparation (for)" , "Made amends" , "Made redress" , "Made up for, say injury" .)