Stiffening agent (6)

I believe the answer is:

starch

'stiffening agent' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for starch that I've seen before include "Stuff that stiffens cloth" , "Stiffener in the laundry" , "Carbohydrate found in potatoes, wheat, and rice" , "Charts (anag) - formality" , "Fabric stiffener" .)

I've seen this clue in The Times, The Telegraph, The Mirror and The Guardian.

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