Mohammedan claims I am converted (7)

I believe the answer is:

islamic

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'converted' is the definition.
Although both the answer and definition are adjectives, I don't see how one could define the other.

'mohammedan claims i am' is the wordplay.
'claims i' anagrams to 'ISLAMIC'.
But, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for islamic that I've seen before include "Of the Arabic religion" , "Of Mohammed's religion" , "of faith" , "Concerning the Muslim religion" , "Relating to Muhammad's religion" .)

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

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