Courageous person (4)
I believe the answer is:
hero
'courageous person' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for hero that I've seen before include "Exceptionally brave person" , "Principal male figure in a story" , "Courageous man" , "Chief good guy in a book or film" , "Person lauded for bravery" .)