Crossword Genius

Harbor marker (4)

Ross

I believe the answer is:

buoy

'harbor marker' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for buoy that I've seen before include "Floating sea marker" , "Sea-lane marker" , "Warning floater" , "Floating navigation mark" , "keep from going under" .)

I've seen this clue in the USA Today, the Newsday, the Newsday.com, the Wall Street Journal and the Family Time.
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