Major river of central Africa also called the Zaire River (5)

I believe the answer is:

congo

(Other definitions for congo that I've seen before include "Crazily entertaining" , "Central African region" , "former African nation" , "Former name of Zaire" , "Africa country and river" .)

I've seen this clue in The Mirror.

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.