Seduced by bum with dated expression (7)

I believe the answer is:

cajoled

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'seduced by bum with dated expression' is the definition.
Although both the answer and definition are past participle verbs, I cannot see how they can define each other.

This is the entire clue.

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(Other definitions for cajoled that I've seen before include "got round" , "Brought round" , "Coaxed (into action)" , "'Inveigled, coaxed (7)'" , "Wheedled" .)

I've seen this clue in The Guardian.

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