Crossword Genius

Card game we hear (5)

Ross

I believe the answer is:

heart

I'm a little stuck... Click here to teach me more about this clue!

'card' is the definition.
(the hearts are a playing card suit)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for heart that I've seen before include "Core; organ" , "Centre; valour" , "Body organ" , "It beats" , "It's in the chest" .)

I've seen this clue in The Globe and Mail.
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