Muslim of high calling? (7)

I believe the answer is:

muezzin

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'muslim' is the definition.
(I know that muezzin is a type of muslim)

I can't explain the rest of the clue.

(Other definitions for muezzin that I've seen before include "Mosque official caller" , "He proclaims the hours of prayer from 23 Across" , "He calls Muslims to prayer (from a minaret)" , "Minaret crier" , "He calls the faithful to prayer" .)

I've seen this clue in The Globe and Mail.

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