Hazards to shipping (8)

I believe the answer is:

icebergs

(Other definitions for icebergs that I've seen before include "Large masses of floating ice" , "Arctic sea hazards" , "Masses of frozen water and lettuces" , "Only small parts can be seen above the water" , "Large masses floating at sea in polar regions" .)

I've seen this clue in The Telegraph.

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