A breakwater or sea-wall (7)

I believe the answer is:

bulwark

(Other definitions for bulwark that I've seen before include "Defensive wall" , "Buttress" , "Rampart" , "Fortification - side of ship above deck" , "defence" .)

I've seen this clue in The Irish Times.

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.