Has learned to sound the hooter (5)
I believe the answer is:
knows
(Other definitions for knows that I've seen before include "Is aware of" , "Recognises" , "Understands" .)
I've seen this clue in the Evening Standard.
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.