Crossword Genius

Lettuce that may be a danger to shipping (7)

Ross

I believe the answer is:

iceberg

I believe this is a double definition.

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

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

'that may be' acts as a link.

(Other definitions for iceberg that I've seen before include "danger at sea" , "Type of floe" , "sort of lettuce" , "Unlikely feature of Cos" , "calf, perhaps" .)

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