I'm a leader of Muslims (4)

I believe the answer is:

imam

I'm a little stuck... Click here to teach me more about this clue!

'leader of muslims' is the definition.
'imam' can be an answer for 'leader' (imam is a kind of leader). I am unsure of the 'of muslims' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for imam that I've seen before include "Ma, I'm off to find religious Muslim" , "Strict religious leader" , "Mosque's prayer leader" , "Person leading devotions in a mosque" , "Prayer-leader in a mosque" .)

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

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