Carbohydrate in food (6)

I believe the answer is:

starch

(Other definitions for starch that I've seen before include "Carbohydrate found in potatoes, wheat, and rice" , "Formality - give stiffness" , "Stiffener in the laundry" , "ceremony" , "Stiffening carbohydrate" .)

I've seen this clue in The Guardian.

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