Pilgrim fooled. Journey's beginning on island (5)
I believe the answer is:
hadji
'pilgrim' is the definition.
(hadji is a kind of pilgrim)
'fooled journey's beginning on island' is the wordplay.
'fooled' becomes 'had' (to have someone can mean to trick them).
'beginning' says to take the initial letters.
'on' says to put letters next to each other.
'island' becomes 'i'.
The first letter of 'journeys' is 'j'.
'had'+'j'+'i'='HADJI'
(Other definitions for hadji that I've seen before include "One who has made a pilgrimage to Mecca" , "One who has been a pilgrim to Mecca" , "Religious traveller" , "Muslim who has made a pilgrimage to Mecca" .)