US state and river (11)

I believe the answer is:

mississippi

(Other definitions for mississippi that I've seen before include "US state, joined 1817" , "US state, capital Jackson" , "State of southern USA" , "American state" , "Long river of North America" .)

I've seen this clue in The Times.

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.