Crossword Genius

Socially shunned — stole off to become so? (4-10)

Ross

I believe the answer is:

cold-shouldered

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'socially shunned' is the definition.
Although both the answer and definition are past participle verbs, I can't understand how one could define the other.

I don't understand the remainder of the clue.

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I've seen this clue in The Times.
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