It's ok to take a dive in this game! (4)

I believe the answer is:

pool

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'this game' is the definition.
(pool is a kind of game)

I don't understand how the remainder of the clue works.

(Other definitions for pool that I've seen before include "Puddle - game with balls" , "Lido - kitty - ball game" , "Small area of still water" , "Reserve" , "Game played on a table with six pockets" .)

I've seen this clue in The Irish Times.

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