Guide some eponymous hero (5)
I believe the answer is:
usher
'guide' is the definition.
(an usher guides people)
'some eponymous hero' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'USHER' is hidden within 'eponymous hero'.
(Other definitions for usher that I've seen before include "He shows people to their seats in theatre" , "Doorkeeper, escort" , "Show in - escort" , "Minor court official" , "Doorkeeper in parliament or 29 down" .)