Crossword Genius

Substance which sustains a living organism (8)

Ross

I believe the answer is:

nutrient

(Other definitions for nutrient that I've seen before include "Substance that nourishes" , "Substance that provides nourishment, may be included in 6 Down" , "Something providing nourishment" , "vitamin maybe" , "Nourishing substance" .)

I've seen this clue in The Guardian.
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