Longfellow's hero (8)
I believe the answer is:
hiawatha
'longfellow's hero' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for hiawatha that I've seen before include "Indian chieftain, subject of a Longfellow poem" , "Longfellow's legendary native American chief" , "Famous Indian" , "Hero of a poem by Longfellow" , "Indian chief" .)