Worshipper in a gurdwara (4)
I believe the answer is:
sikh
'worshipper in a gurdwara' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sikh that I've seen before include "Follower of Indian religion" , "someone in India?" , "Pardon (sin); send (money) in payment" , "Member of an Indian religion" , "Guru's disciple" .)