By-product of cheese production (4)

I believe the answer is:

whey

(Other definitions for whey that I've seen before include "Cheese-making by-product" , "Watery dairy product" , "Watery stuff from clotted milk" , "Separated part of milk" , "Part of 26 Across" .)

I've seen this clue in The Guardian.

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.