Carb in rice and potatoes (6)

I believe the answer is:

starch

(Other definitions for starch that I've seen before include "Stiffening agent" , "Carbohydrate; stiffen" , "Carbohydrate found in potatoes, wheat etc." , "Stiffener in the laundry" , "Potato, rice constituent; a stiffener" .)

I've seen this clue in the USA Today.

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