One of the two main branches of Islam (4)
I believe the answer is:
shia
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">one of the two main branches of islam</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for shia that I've seen before include "A major denomination of Islam" , "A_main branch of Islam" , "One of the two main branches of orthodox Islam" , "A main branch of Islam" .)