Uterus (4)
I believe the answer is:
womb
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">uterus</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for womb that I've seen before include "Uterus" , "Place of gestation" , "Embryo's home" , "Organ housing fetus" , "Place of conception" .)