Crossword Genius

Idiot losing pounds — an indefinite number — in card game (5)

Ross

I believe the answer is:

poker

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'card game' is the definition.
(I know that poker is a type of card game)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for poker that I've seen before include "Jabber" , "Fire prodder; game" , "Card-game" , "Pushy person" , "Gambling card game" .)

I've seen this clue in The Times.
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