Crossword Genius

Stiffen (6)

Ross

I think it could be either:

starch

harden

'stiffen' is the definition.
(starching is a kind of stiffening)

This is all the clue.

(Other definitions for starch that I've seen before include "Formality - makes things stiff" , "Carbohydrate that occurs in all green plants" , "Carbohydrate found in potatoes, wheat etc." , "Carbohydrate; stiffen" , "Stiffening carbohydrate" .)

I've seen this clue in the Evening Standard.
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