Bombay believer (5)
I believe the answer is:
hindu
'bombay believer' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hindu that I've seen before include "Indian religious adherent" , "Believer in an Indian religion" , "Follower of great Indian religion" , "Most of the Indians are" , "Follower of a major religion of the Indian subcontinent" .)