River which rises in N Wyoming, flowing through America's largest national park towards the Missouri (11)

I believe the answer is:

yellowstone

(Other definitions for yellowstone that I've seen before include "First US national park, 1872" , "US river" , "River with falls in Wyoming" , "Topaz, perhaps" .)

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.