Crossword Genius

Bikini, e.g. (5)

Ross

I believe the answer is:

atoll

(Other definitions for atoll that I've seen before include "Coral island(s) surrounding a lagoon" , "Ring of coral" , "Ring-shaped coral reef enclosing a lagoon" , "Circular coral reef" , "tropical paradise?" .)

I've seen this clue in the Penny Press and The New York Times.
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