Behaved (5)
I believe the answer is:
acted
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">behaved</span>' is the definition.<br/ ><span class="explanation-format__explanation">('act' can be a synonym of 'behave')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for acted that I've seen before include "Feigned" , "participated in panto maybe" , "Behaved in a certain manner" , "Play a role" , "Behaved or played a part" .)