With disdain, is finished with the old-fashioned stuff (5)

I believe the answer is:

scorn

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'with disdain' is the definition.
'scorn' can be an answer for 'disdain' (synonyms). I am not sure about the 'with' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for scorn that I've seen before include "Open contempt, disdain" , "Disdain or derision" , "Disgust" , "Look at with disdain" , "Slight" .)

I've seen this clue in the Evening Standard.

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