Retribution, destiny (7)
I believe the answer is:
nemesis
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">retribution</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(spirit of retribution in Greek mythology)</span><br/ ><br/ >'<span class="explanation-format__original">destiny</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for nemesis that I've seen before include "Destiny" , "Retribution personified" , "opponent you can't beat" , "Nee Miss (anag.)" , "Something causing misery (or death) - Meissen (anag)" .)