Homer's epic poem (7)
I believe the answer is:
odyssey
'homer's epic poem' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for odyssey that I've seen before include "Significant journey (by Homer?)" , "Long, eventful, wandering journey" , "Epic poem - epic voyage" , "A long adventurous journey - see Homer" , "Homer's epic poen about great journey" .)