A game played by two teams of swimmers (5,4)

I believe the answer is:

water polo

(Other definitions for water polo that I've seen before include "Team sport played in a swimming pool" , "Game played by teams of swimmers with large ball" , "Swimming pool game" , "Game played by tams of swimmers with large ball (5.4)" , "Sport for swimmers" .)

I've seen this clue in the Sydney Morning Herald.

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