An Odysseus in another Odyssey? (4)
I believe the answer is:
hero
'an odysseus' is the definition.
(Odysseus is a hero in Greek myth)
'in another odyssey?' is the wordplay.
'in' indicates the answer is hidden within the clue.
'HERO' is hidden within 'another odyssey'.
(Other definitions for hero that I've seen before include "Chief good guy in a story" , "eg Achilles" , "lover whose lamp went out tragically" , "Book's chief character" , "Principal boy" .)