Sphere; dance (4)
I believe the answer is:
ball
I believe this clue is a double definition.
'sphere' is the first definition.
(I know that ball is a type of sphere)
'dance' is the second definition.
(ball is a kind of dance)
(Other definitions for ball that I've seen before include "that one might throw?" , "Formal social event" , "Sphere; function" , "20" , "form of entertainment" .)