Stadium waterproofing (4)

I believe the answer is:

dome

(Other definitions for dome that I've seen before include "millennium feature" , "Hemispherical roof" , "Cupola - millennium building" , "Crown" , "Rounded vault of a roof" .)

I've seen this clue in the Newsday.

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.