"August: ___ County" (Tracy Letts play) (5)

I believe the answer is:

osage

(Other definitions for osage that I've seen before include "Age so (anag) - member of a Native American people" , "People of America" , "Missouri tribe; go sea (anag.)" , "Amerindian" , "Member of the Native American people, once occupying the Missouri valley" .)

I've seen this clue in The New York Times.

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