Dismissive rascal adores sinful coulis at heart (8)

I believe the answer is:

scornful

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'dismissive' is the definition.
(thesaurus)

'rascal adores sinful coulis at heart' is the wordplay.
I cannot quite understand how this works, but
'heart' could be 'cor' (I've seen this in another clue) and 'cor' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for scornful that I've seen before include "Disdainful, contemptuous" , "Expressing extreme contempt" , "Dismissive, contemptuous" , "Contemptuous or derisory" , "Openly contemptuous" .)

I've seen this clue in The Irish Times.

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