Game of chance involving balls (5)

I believe the answer is:

lotto

'game of chance involving balls' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for lotto that I've seen before include "Children's game similar to bingo" , "Game of chance based on numbered balls being drawn at random" , "National gambling game" , "Children's game, housey-housey" , "house" .)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.

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