One hears word of it (5)

I believe the answer is:

mouth

I'm a little stuck... Click here to teach me more about this clue!

But I can't explain it at all! Could you help me understand?

(Other definitions for mouth that I've seen before include "River ending" , "River part - conversation opener?" , "Gob" , "River outlet" , "Sauce" .)

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.