Crossword Genius

Lettuce is a shipping hazard (7)

Ross

I believe the answer is:

iceberg

I believe this clue is a double definition.

'lettuce' is the first definition.
(iceberg lettuce is a kind of lettuce)

'a shipping hazard' is the second definition.
(I've seen this before)

'is' is the link.

(Other definitions for iceberg that I've seen before include "arctic feature" , "Maritime danger, mostly underwater" , "One destroyed the Titanic" , "Frozen floater" , "A floating ice mountain" .)

I've seen this clue in The Mirror.
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