Nativity (5)
I believe the answer is:
birth
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nativity</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for birth that I've seen before include "Parentage" , "Start (of something)" , "Beginning; ancestry" , "Nascence" , "Nativity" .)