Formal dances (5)
I believe the answer is:
balls
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">formal dances</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for balls that I've seen before include "Spheres, globes" , "deliveries" , "Rubbish" , "nonsense" , "Formal dances" .)