Didn't just sit there (5)
I believe the answer is:
acted
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">didn't just sit there</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for acted that I've seen before include "Behaved or performed" , "Performed (in a play)" , "Feigned" , "appeared on stage" , "Worked" .)