Pool game? (4)
'pool game?' is the definition.
'polo' can be an answer for 'game?' (polo is a kind of game). I am not sure about the 'pool' bit.
'pool game?' is the wordplay.
'game?' indicates an anagram (I've seen 'game' mean this (solving anagrams is a game)).
'pool' anagrammed gives 'POLO'.
Can you help me to learn more?
(Other definitions for polo that I've seen before include "Top" , "Game; Italian explorer" , "Game played on horseback or in pool" , "jersey" , "What riders might get up to in a team" .)
'pool game' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for water polo that I've seen before include "Sport for swimmers" , "Game played by tams of swimmers with large ball (5.4)" , "Team sport with wet participants" , "Game played by swimming teams with large ball" , "Team sport played in a swimming pool" .)