Crossword Genius

A game involving packs (7)

Ross

I believe the answer is:

canasta

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

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

Can you help me to learn more?

(Other definitions for canasta that I've seen before include "Card game resembling rummy" , "Form of rummy using two decks of cards and four jokers" , "this needs two packs" , "Card-game played with two packs of cards" , "Decorated with artificial jewels" .)

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