Hazard to shipping (7)

I think it could be either:

iceberg

icefloe

(Other definitions for iceberg that I've seen before include "obstacle, in the main" , "Hazard of polar seas" , "Floating mass (of lettuce?)" , "A floating ice mountain" , "Unlikely feature of Cos" .)

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.