Crossword Genius

Fizz with impatience, do they? (8)

Ross

I believe the answer is:

champers

'fizz' is the definition.
(both are informal terms for champagne)

I don't understand the remainder of the clue.

(Other definitions for champers that I've seen before include "People putting their teeth in" , "celebratory drink" , "Kind of sparkling wine (slang)" , "Bubbly" , "People who eat" .)

I've seen this clue in The Guardian.
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