Crossword Genius

What gives a gin fizz its fizz (4)

Ross

I believe the answer is:

soda

(Other definitions for soda that I've seen before include "Type of bread, water or fountain" , "Variety of pop" , "Fizzy drink - chemical compound" , "Whisky mixer" , "Fizzy water, goes well with whiskey" .)

I've seen this clue in The New York Times.
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