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" .)

I've seen this clue in the Evening Standard and The Globe and Mail.

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