An exclamation, not really of scorn! (3)

I believe the answer is:

cor

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'an exclamation not really' is the definition.
I can't tell whether this definition defines the answer.

'of scorn' is the wordplay.
'of' indicates a hidden word.
'COR' is hidden in the letters of 'scorn'.

Can you help me to learn more?

(Other definitions for cor that I've seen before include "Expression of surprise" , "Surprised expression" , "Gosh" , "Blimey" .)

I've seen this clue in the Evening Standard.

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