Barrie's hero (5,3)
I believe the answer is:
peter pan
'barrie's hero' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for peter pan that I've seen before include "J M Barrie's boy who never grew up" , "J. M. Barrie's hero" , "JM Barrie character" , "J M Barrie's ever-young boy" , "J M Barrie's boy who never grows up" .)