Imam's holy book (5)
I believe the answer is:
koran
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">imam's holy book</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 koran that I've seen before include "Sacred book of Islam with revelations of Muhammad" , "Holy book of Islam" , "Muslim holy book" , "Sacred book of Islam (5)" , "Sacred writings of Islam" .)