Crossword Genius

Danger for a mariner (4)

Ross

I believe the answer is:

reef

(Other definitions for reef that I've seen before include "Great Barrier formation?" , "Rocks in shallow water - kind of knot" , "Type of knot" , "The sort of knot" , "Bank of jagged rock near the surface of the sea" .)

I've seen this clue in The New York Times.
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