Shakespearean schemer (4)
I believe the answer is:
iago
'shakespearean schemer' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for iago that I've seen before include "stage villain" , "The villain who tricked Othello" , "Othello's nemesis" , "Advisor to soldier" , "Othello's enemy" .)