First Bible book (7)
I believe the answer is:
genesis
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">first bible book</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for genesis that I've seen before include "name of group" , "Origin or formation of something" , "rock band" , "Old Testament Book 1" , "Beginning the holy book" .)