Crossword Genius

Coral barrier (4)

Ross

I believe the answer is:

reef

'coral 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 "Chain of rocks underwater" , "Free (anag.)" , "Underwater obstruction" , "Rocky ridge near sea surface" , "Rock near water's surface" .)

I've seen this clue in the Penny Press.
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