Crossword Genius

Key dietary requirement, obtained from meat, eggs, milk and legumes (7)


I believe the answer is:


(Other definitions for protein that I've seen before include "Dietary requirement" , "A body chemical; pointer (anag.)" , "Not ripe (anag.)" , "Dietary component -- 23 across (anag)" , "Essential ingredient of food" .)

I've seen this clue in The Guardian.
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