Numbers game - Crossword Clue, Answer and Explanation

'numbers game' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for lotto that I've seen before include "chancy business" , "Game like bingo" , "Venetian painter - gambling game" , "gamble" , "Prize draw" .)

I've seen this clue in The Daily Express, the Penny Press, The Guardian, The New York Times, the Sydney Morning Herald, The Times and The Wall Street Journal.

'numbers' is the definition.
(five is a kind of number)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for fives that I've seen before include "Ball game" , "Small numbers" , "Game similar to squash" , "Squash relative" , "horse disease as before" .)

I've seen this clue in The Daily Express, the Penny Press, The Guardian, The New York Times, the Sydney Morning Herald, The Times and The Wall Street Journal.

'numbers game' is the definition. (I've seen this in another clue) This is all the clue.

(Other definitions for keno that I've seen before include "2 8 [CASINO GAME]" , "A bingo-like game" , "game of chance" , "gambling game" , "gambler's choice" .)

I've seen this clue in The New York Times, the Newsday and the LA Times.

'numbers game' is the definition. (I've seen this in another clue) This is all the clue.

(Other definitions for lottery that I've seen before include "Chance competition" , "Random draw of numbers from a drum to raise money" , "Random prize game" , "Matter of chance" , "try his luck here" .)

I've seen this clue in the Penny Press.

Numbers game (5)