Chief good guy in a story (4)
I believe the answer is:
hero
'chief good guy in a story' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for hero that I've seen before include "Chief good guy in a book or film" , "Man admired for courage and achievement" , "Courageous man" , "Man of outstanding courage" , "girl a ring" .)