Crossword Genius

To us, possibly, it's an unsettling thing to do (4)

Ross

I believe the answer is:

oust

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'an unsettling thing to do' is the definition.
I can't tell whether this definition defines the answer.

'to us possibly' is the wordplay.
'possibly' indicates an anagram.
'to'+'us'='tous'
'tous' anagrammed gives 'OUST'.

'it's' acts as a link.

Can you help me to learn more?

(Other definitions for oust that I've seen before include "Force out; supplant" , "Get rid of" , "Unseat" , "Remove from a position of power" , "Extract" .)

I've seen this clue in the Evening Standard.
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