Victim of Iago (6)
'victim of iago' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for emilia that I've seen before include "Wife of Iago (Othello)" , "Italian girl" , "- - Fox, film actress" .)
(Other definitions for cassio that I've seen before include "One accused of being Desdemona's lover (Othello)" , "Friend of Othello (Shak.)" , "Character in Othello" , "Othello's lieutenant" , "Michael in play" .)