Young people (9)
I believe the answer is:
teenagers
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">young people</span>' is the definition.<br/ ><span class="explanation-format__explanation">(people aged between twelve and twenty)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for teenagers that I've seen before include "They're between the onset of puberty and maturity, generally" , "Adolescents" , "Young people" , "They're aged between 13 and 19" , "Youngsters" .)