Listener’s search for believer (4)

I believe the answer is:

sikh

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'for believer' is the definition.
(believer in Sikhism)

I can't explain the remainder of the clue.

(Other definitions for sikh that I've seen before include "Member of an Indian religion" , "Member of a Hindu religion" , "Follower of a religion founded in Punjab" , "Member of Indian religious group, wears turban" , "Member of religion originating in Punjab" .)

I've seen this clue in The Times.

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