Dance; delivery (4)
I believe the answer is:
ball
I believe this clue is a double definition.
'dance' is the first definition.
(ball is a kind of dance)
'delivery' is the second definition.
(ball is a kind of delivery)
(Other definitions for ball that I've seen before include "Bouncer, say" , "Perhaps a bouncer < 's clog" , "Spherical object" , "Formal social event" , "Formal dance gathering" .)