Crossword Genius

Milk serum (4)

Ross

I believe the answer is:

whey

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">milk serum</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for whey that I've seen before include "Residue from junket" , "Watery dairy product" , "Milk by-product" , "Watery stuff from clotted milk" , "Watery liquid left when milk forms curds" .)

I've seen this clue in The Sunday Times.
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