Nourishing substance (4)

I think it could be either:

Which length description are you looking for?:

nutrient

'nourishing substance' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for nutrient that I've seen before include "Source of nourishment" , "Substance providing nourishment" , "Substance to give energy and build tissue" , "Feeding" , "Substance essential for growth" .)

I've seen this clue in The Sun.

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