Pool or polo (4)
I believe the answer is:
game
I believe this is a double definition.
'pool' is the first definition.
(thesaurus)
'polo' is the second definition.
(thesaurus)
(Other definitions for game that I've seen before include "football, perhaps" , "Animals hunted for food" , "Creatures killed for sport" , "Ducks and drakes, for example" , "See 8" .)