Deign to watch prisoner go down (10)

I believe the answer is:

condescend

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'deign' is the definition.
(synonyms)

'prisoner go down' is the wordplay.
'prisoner' becomes 'con' (abbreviation for 'convict').
'go down' becomes 'descend' (synonyms).
'con'+'descend'='CONDESCEND'

'to watch' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for condescend that I've seen before include "Deign" , "Show that one feels superior" , "Do something below one's dignity" , "See fit" , "one does this as a favour?" .)

I've seen this clue in the Sydney Morning Herald.

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