Made reparation (6)
I believe the answer is:
atoned
'made reparation' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for atoned that I've seen before include "Made up for past offence" , "Made up for past wrongdoing" , "Donate (anag)" , "Made up for, say injury" , "Expiated" .)