Crossword Genius

At poker, try not to do so when you have one! (5)

Ross

I believe the answer is:

flush

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But I can't explain it at all! Could you help me understand?

(Other definitions for flush that I've seen before include "with a load of cash" , "winning hand at poker" , "Become red and hot" , "Rich" , "Rouse game and put to flight" .)

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