A game of pool? (4)

I believe the answer is:

polo

'a game' is the definition.
(polo is a kind of game)

'of pool?' is the wordplay.
'of' indicates an anagram (the answer comes from or 'of' the letters).
'pool' anagrammed gives 'POLO'.

(Other definitions for polo that I've seen before include "Game on horseback or in water" , "Team game - VW" , "Game; Venetian explorer" , "Game played on horses or in water" , "Game played in chukkas" .)

I've seen this clue in the Evening Standard.

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