Lawless youth (7)
I believe the answer is:
hoodlum
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lawless youth</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for hoodlum that I've seen before include "Tearaway" , "Mobster" , "Aggressive young criminal" , "Punk" , "Petty ruffian" .)