Crossword Genius

Atoll barrier (4)

Ross

I believe the answer is:

reef

'atoll barrier' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for reef that I've seen before include "Rock formed of coral" , "Rocks in shallow water - kind of knot" , "Low-lying coral ridge" , "Shallow coral ridge" , "Marine formation" .)

I've seen this clue in The Washington Post, the Thinks.com, the L.A. Times Daily and the Universal.
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