Keanu Reeves in "The Matrix" (3)
I believe the answer is:
neo
'keanu reeves in the matrix' 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 "language" , "Prefix meaning new of modern form of" , "Prefix meaning new or recent" , "Prefix meaning new, maybe one" , "Hero of The Matrix films; new (prefix)" .)