One pretending to steal gold for outsider (9)

I believe the answer is:

foreigner

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'for outsider' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

(Other definitions for foreigner that I've seen before include "asylum seeker?" , "chauvinist holds in contempt" , "One from abroad" , "Alien" , "Stranger, outsider" .)

I've seen this clue in The Sun.

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