Do penance (5)
I believe the answer is:
atone
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">do penance</span>' is the definition.<br/ ><span class="explanation-format__explanation">(to do penance is to atone for something)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for atone that I've seen before include "Make reparation for a misdeed" , "Recompense" , "Expiate" , "Turn away from sin and do penance" , "remedy" .)