Round-tripper (5)
I believe the answer is:
homer
'round-tripper' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for homer that I've seen before include "Bird" , "Great Greek author of The Iliad" , "Pigeon; classic writer" , "Great Greek who wrote The Iliad" , "Great Greek poet of the Iliad and the Odyssey" .)