Substance used in her car-body at wreck (12)

I believe the answer is:

carbohydrate

'substance' is the definition.
(carbohydrate is a kind of substance)

'her car-body at wreck' is the wordplay.
'wreck' indicates anagramming the letters.
'her'+'car'+'body'+'at'='hercarbodyat'
'hercarbodyat' with letters rearranged gives 'CARBOHYDRATE'.

'used in' is the link.

(Another definition for carbohydrate that I've seen is " Type of food".)

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

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