Correct as to type of cereal (4)

I believe the answer is:

oats

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'type of cereal' is the definition.
'oats' can be an answer for 'cereal' (type of cereal). I'm unsure of the 'type of' bit.

'correct as to' is the wordplay.
'correct' indicates anagramming the letters.
'as'+'to'='asto'
'asto' anagrammed gives 'OATS'.

Can you help me to learn more?

(Other definitions for oats that I've seen before include "Hardy cereals eaten by horses" , "Cereal plants" , "Porridge mix" , "Wild ones are sown in youthful excess" , "Seed grasses" .)

I've seen this clue in The Globe and Mail.

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