Crossword Genius

Circular coral reef (5)

Ross

I believe the answer is:

atoll

'circular coral reef' is the definition.
(I've seen this before)

This is all the clue.

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

I've seen this clue in The Times, The Mirror, the Evening Standard and The Telegraph.
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