The thin cartilaginous flap that covers the entrance to the larynx during swallowing, preventing food from entering the trachea (10)
I believe the answer is:
epiglottis
(Other definitions for epiglottis that I've seen before include "Thin flap in the throat" , "stop for a breather" .)
I've seen this clue in The Independent.
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.