Cockney expression of scorn? (3)

I believe the answer is:

cor

I'm a little stuck... Click here to teach me more about this clue!

'cockney expression' is the definition.
'cor' can be an answer for 'expression' (I have seen 'Expression of surprise ' mean 'cor' so perhaps 'expression' could also mean 'cor'). I'm not sure about the 'cockney' bit.

'of scorn?' is the wordplay.
'of' indicates the answer is hidden within the clue.
'COR' is hidden within 'scorn'.

Can you help me to learn more?

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

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