Disdainful escaper from prison going down (13)

I believe the answer is:

condescending

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'disdainful' is the definition.
(I've seen this before)

'escaper from prison going down' is the wordplay.
'escaper from prison' becomes 'con' (I can't explain this - if you can you should give a lot more credence to this answer).
'going down' becomes 'descending' ('descend' can be a synonym of 'go down').
'con'+'descending'='CONDESCENDING'

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(Other definitions for condescending that I've seen before include "Offensively patronising" , "Disdainful" , "Showing (to others) that one feels superior" , "Toffee-nosed" , "Snooty" .)

I've seen this clue in The Times.

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