Throw ball at basin (4)
I believe the answer is:
bowl
I believe this is a triple definition!
'throw' is the first definition.
(I've seen this before)
'ball' is the second definition.
(bowl is a kind of ball)
'at' acts as a link.
'basin' is the third definition.
(synonyms)
(Other definitions for bowl that I've seen before include "US stadium for sporting or musical events" , "Soup dish - roll a ball" , "hollow" , "Basin; attack wicket" , "piece of china" .)