Goddess of vengeance (7)
I believe the answer is:
nemesis
'goddess of vengeance' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for nemesis that I've seen before include "(Fate's) retribution" , "Figure of retribution" , "Avenging deity" , "Unbeatable rival" , "Something causing misery (or death) - Meissen (anag)" .)