Activity (6)
I believe the answer is:
action
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">activity</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that activity can be written as action)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for action that I've seen before include "''. . . . . . speaks louder than words'' (6)" , "Accomplishment" , "Battle (in the law courts?)" , "Lawsuit; armed conflict" , "A judicial proceeding brought by one party against another" .)