Crossword Genius

Missouri River tributary (5)

Ross

I believe the answer is:

osage

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">missouri river tributary</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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 Washington Post, the LA Times and The New York Times.
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