Adult female (5)
I believe the answer is:
woman
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">adult female</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for woman that I've seen before include "Lady" , "See 16" , "Mature female" , "With 1a [OLD], one's rather timid" , "person not going on stag-night" .)