Crossword Genius

Old area excluding one state (6)

Ross

I believe the answer is:

oregon

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'one state' is the definition.
(Oregon is an example)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for oregon that I've seen before include "area of America" , "Salem is this State's capital" , "America's Beaver State" , "US region" , "area of the US" .)

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