Leak-proof (10)

I believe the answer is:

watertight

(Other definitions for watertight that I've seen before include "Closely sealed" , "Impermeable - unbreakable" , "Impregnable" , "seaworthy" , "Proof against leaking" .)

I've seen this clue in the Sydney Morning Herald.

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.