Greek trilogy, trio translated with ease (8)
I believe the answer is:
oresteia
'greek trilogy' is the definition.
'trio translated with ease' is the wordplay.
'translated with' is an anagram indicator.
'trio' with its letters mixed up with 'ease' makes 'ORESTEIA'.
(Other definitions for oresteia that I've seen before include "Greek plays" , "Play trilogy by Aeschylus, see a riot (anag.)" , "three tragedies for Aeschylus" , "Aeschylus's play trilogy" .)