He’s responsible for the dispossession (9)

I believe the answer is:

exorciser

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'he's responsible for the dispossession' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

This is the entire clue.

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(Another definition for exorciser that I've seen is " Dispiriting person".)

I've seen this clue in the Evening Standard.

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