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Bring princess's cowboys on board to perform an exorcism (10)

Ross

I believe the answer is:

dispossess

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'bring' is the definition.
The definition and answer can be both to do with ownership as well as being verbs in their base form.
Perhaps there's a link between them I don't understand?

'princess's cowboys on board to perform an exorcism' is the wordplay.
I cannot really understand how this works, but
'princess's' could be 'dis' (Princess Diana) and 'dis' is found in the answer.
'on board' could be 'ss' (I've seen this in other clues) and 'ss' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for dispossess that I've seen before include "Deprive of land and property" , "Drive out l" , "Deprive (someone) of land/property" , "Expel" .)

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