Mails sorted for the Mohammedan world (5)
I believe the answer is:
islam
'the mohammedan world' is the definition.
The definition and answer can be both groups as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'mails sorted' is the wordplay.
'sorted' indicates anagramming the letters.
'mails' with letters rearranged gives 'ISLAM'.
'for' is the link.
Can you help me to learn more?
(Other definitions for islam that I've seen before include "Koran its scripture" , "Mails to Muslim religion" , "Major world religion" , "Religious faith of Muslims" , "Mohammed's religion" .)