Crossword Genius

A game faced impassively (5)

Ross

I believe the answer is:

poker

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for poker that I've seen before include "One of many irons in the fire" , "declared to be stiff" , "Epitome of stiffness" , "Fire-iron" , "Fire prodder; game" .)

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