Crossword Genius

Missouri River tributary (5)

Ross

I believe the answer is:

osage

'missouri river tributary' is the definition.
(I've seen this in another clue)

This is the entire clue.

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

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