"The Matrix" role (3)
I believe the answer is:
neo
'the matrix role' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for neo that I've seen before include "Prefix meaning new of modern form of" , "Prefix meaning new - try one" , "Prefix meaning new or recent" , "New (suffix)" , "Hero of The Matrix films; new (prefix)" .)