Ballroom activity (7)
I believe the answer is:
dancing
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ballroom activity</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 dancing that I've seen before include "Moving to music" , "Taking a series of rhythmical steps and movements in time to music" , "Terpsichorean exercise" , "Performing ballet" , "Strictly Come - - (TV)" .)