Mark Twain hero (3,6)
I believe the answer is:
tom sawyer
'mark twain hero' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for tom sawyer that I've seen before include "Mark Twain character" , "American boy" , "book's hero" , "Mark Twain's adventurous boy" , "Boy whose Adventures were recorded by Mark Twain" .)