Religious traveller (7)
I believe the answer is:
pilgrim
'religious traveller' is the definition.
(someone travelling on pilgrimage)
This is all the clue.
(Other definitions for pilgrim that I've seen before include "One progressive type" , "Traveller to a sacred place like Mecca" , "Mecca visitor" , "Person who journeys for religious reasons" , "Wayfarer to holy site" .)