Protein substance — nut gel (anag) (6)

I believe the answer is:

gluten

(Other definitions for gluten that I've seen before include "Gluey protein substance in wheat" , "Protein in grain that gives cohesiveness to dough" , "Sticky substance" , "Protein found in cereals" , "Protein present in wheat" .)

I've seen this clue in The Guardian.

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