Muslim religion (5)
I believe the answer is:
islam
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">muslim religion</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(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" .)