"Julius Caesar" role (5)
I believe the answer is:
casca
'julius caesar role' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for casca that I've seen before include "Roman conspirator" , "Stabbed by him, Caesar" , "Envious conspirator (J. Caesar)" , "Conspirator responsible for rent" , "plotter against Caesar" .)