Crossword Genius

Ring-shaped reef (5)

Ross

I believe the answer is:

atoll

(Other definitions for atoll that I've seen before include "Coral island with central lagoon" , "Circular coral reef" , "Coral island surrounding a lagoon" , "Ring of coral" , "Land around a lagoon, such as Bikini" .)

I've seen this clue in The Times, the LA Times, the USA Today, The Telegraph and The New York Times.
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