Worshipper for whom church in Dudley providing sanctuary (5)
I believe the answer is:
hindu
'worshipper' is the definition.
(worshipper of Hindu gods)
'church in dudley providing sanctuary' is the wordplay.
'providing sanctuary' indicates the answer is hidden within the clue (the answer is given sanctuary within the clue).
'HINDU' can be found hidden inside 'church in dudley'.
'for whom' acts as a link.
(Other definitions for hindu that I've seen before include "One practising an Indian religion" , "Brahma is one of his gods" , "Follower of India's most popular religion" , "Believer in South Asian religion" , "Member of religious group" .)