Of birth (5)
I believe the answer is:
natal
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">of birth</span>' is the definition.<br/ ><span class="explanation-format__explanation">(natal means relating to birth)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for natal that I've seen before include "Of or from one's birth - in S African province" , "African area" , "Like a birthday" , "Relating to the time of one's birth" , "Of birth; former African republic" .)