Blackmail divorcee, perhaps twisting, getting caught (9)

I believe the answer is:

extortion

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'blackmail divorcee perhaps' is the definition.
(I know that Blackmail is a type of extortion)

I can't explain the rest of the clue.

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(Other definitions for extortion that I've seen before include "The obtaining of money by force or threat" , "Blackmail" , "Extraction of money with menaces" .)

I've seen this clue in The Times.

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