Expiate (5)
I believe the answer is:
atone
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">expiate</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for atone that I've seen before include "Make up, compensate (for)" , "Make amends, being at one" , "remedy" , "Make redress" , "Make amends (for something)" .)