Superstar charged without much formality (6)

I believe the answer is:

starch

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'formality' is the definition.
(being excessively formal or stiff)

'superstar charged without much' is the wordplay.
'STARCH' is hidden within the letters.
But, I am uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for starch that I've seen before include "Carbohydrate found in potatoes, wheat, and rice" , "Fabric stiffener" , "It stiffens shirts and collars" , "Stiffener in the laundry" , "Formal quality" .)

I've seen this clue in the Sydney Morning Herald.

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