Crossword Genius

It’s the decolonisation that’s upsetting (10)

Ross

I believe the answer is:

unsettling

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'upsetting' is the definition.
(unsettling is a kind of upsetting)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for unsettling that I've seen is " Disturbing".)

I've seen this clue in the Evening Standard.
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