Mali's religion? (5)

I believe the answer is:

islam

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'religion?' is the definition.
(Islam is a religion)

'mali's' is the wordplay.
'mali's' anagrams to 'ISLAM'.
However, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for islam that I've seen before include "Religion of the Koran" , "Adherents of a religion" , "Religion based on Muhammad's teachings" , "Major world religion" , "Mohammed's religion" .)

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

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