Crossword Genius

Dietary requirement (7)

Ross

I believe the answer is:

protein

'dietary requirement' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for protein that I've seen before include "Combination of amino acids in living matter" , "A body chemical; pointer (anag.)" , "Not ripe (anag.)" , "Body-builder" , "Important dietary component" .)

I've seen this clue in The Guardian.
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