Native American pledged to stay with uncle? (6)

I believe the answer is:

pawnee

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'native american' is the definition.
(Pawnee is an example)

I don't understand the rest of the clue.

(Other definitions for pawnee that I've seen before include "North American Indian - one taking a pledge" , "N American native" , "one living in America" .)

I've seen this clue in the Evening Standard.

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