Crossword Genius

Desert hero ultimately stopping return of non-British rule? (4,3,2)

Ross

I believe the answer is:

walk out on

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'desert' is the definition.
(walking out on is a kind of deserting)

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

Can you help me to learn more?

(Another definition for walk out on that I've seen is " Desert".)

I've seen this clue in The Times.
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