Part of somebody's Seychelles journey (7)
I believe the answer is:
Here is my best explanation:
'journey' is the definition.
(odyssey is a kind of journey)
'part of somebody's seychelles' is the subsidiary indication.
'part of' says the answer is hidden in the clue.
'odyssey' can be found hidden inside 'somebodys seychelles'.
(Other definitions for odyssey that I've seen before include "Heroic journey", "Homer's epic poem", "Eventful journey", "Epic wanderings of Ulysses", "Greek epic on the wanderings of Ulysses", "A long arduous journey as described by Homer", "'Long eventful journey, such as that of Ulysses (7)'", "Homer epic", "Wandering journey" and "Significant journey (by Homer?)".)