Origin, beginning (7)
I believe the answer is:
genesis
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">origin</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">beginning</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that genesis is a type of beginning)</span><br/ ><br/ ></span>
(Other definitions for genesis that I've seen before include "Origin -- see sign (anag)" , "rock band" , "Beginning the holy book" , "Origin or formation of something" , "Origin; Bible book" .)