Crossword Genius

Kind of protein for bodybuilders (4)

Ross

I believe the answer is:

whey

(Other definitions for whey that I've seen before include "Separated part of milk" , "Milk by-product" , "Product of clotting milk" , "Cheese-making by-product" , "part of natural drink" .)

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