Many a cocktail mixer (4)

I believe the answer is:

soda

(Other definitions for soda that I've seen before include "Whisky mixer" , "for use with whisky?" , "fizz" , "Mixer drink" , "Fizzy water, goes well with whiskey" .)

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

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.