River swirl (4)

I believe the answer is:

eddy

(Other definitions for eddy that I've seen before include "religious leader" , "Circular movement of air" , "Fellow" , "Whirling current" , "dangerous bit of water" .)

I've seen this clue in The New York 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.