Missouri or Monongahela (5)

I believe the answer is:

river

'missouri or monongahela' is the definition.
(I know that Missouri River is a river)

This is the entire clue.

(Other definitions for river that I've seen before include "Eg, Amazon" , "Thames is one" , "Such as the Nile or Amazon" , "Eg, Thames or Nile" , "Eg, the Rhine" .)

I've seen this clue in The Wall Street Journal.

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