Grown-ups (6)
I believe the answer is:
adults
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">grown-ups</span>' is the definition.<br/ ><span class="explanation-format__explanation">(a grown-up is an adult)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for adults that I've seen before include "Fully developed and mature" , "Mature animals" , "Grown-ups, mature people" , "Fully developed animals" , "They're fully grown" .)