First book of the Bible (7)
I believe the answer is:
genesis
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">first book of the bible</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 genesis that I've seen before include "Origin (of the Old Testament?)" , "First book of the Old Testament" , "Beginning the holy book" , "Band; book" , "rock band" .)