A warning to other motorists? (4)

I believe the answer is:

honk

(Other definitions for honk that I've seen before include "Cry of the wild goose" , "Cry of a goose - sound of a horn" , "Toot of a horn - cry of a goose - smell nasty" , "Toot one's horn" .)

I've seen this clue in The Guardian.

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.