Muslim religion (5)

I believe the answer is:

islam

'muslim religion' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for islam that I've seen before include "Mails to great eastern religion" , "Religion based on teachings of Muhammad" , "Mails to Muslim religion" , "Creed" , "Mohammed's religion" .)

I've seen this clue in The Independent, The Guardian and the Evening Standard.

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