Agent of retribution (7)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">agent of retribution</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for nemesis that I've seen before include "The Greek goddess of divine retribution and vengeance" , "Vengeful justice" , "Retribution personified" , "curse" , "opponent you can't beat" .)
(Other definitions for avenger that I've seen before include "One exacting retribution" , "One seeking retribution" , "One who exacts reparation for a wrong" , "Retaliator" , "One exacts retribution" .)