Medicine ball (4)
I believe the answer is:
pill
I believe this is a double definition.
'medicine' is the first definition.
(pill is a kind of medicine)
'ball' is the second definition.
(humorous term for the ball in some sports)
(Other definitions for pill that I've seen before include "may be the cure" , "Medicinal pellet" , "Pellet of medicine" , "Medication" , "Dose of medicine" .)