Misbehaved (5,2)
I believe the answer is:
acted up
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">misbehaved</span>' is the definition.<br/ ><span class="explanation-format__explanation">(acting up is a kind of misbehaving)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for acted up that I've seen before include "Behaved badly" , "carried on" .)