Crossword Genius

Coral reef (5)

Ross

I believe the answer is:

atoll

'coral reef' is the definition.
(atoll is a kind of coral reef)

This is the entire clue.

(Other definitions for atoll that I've seen before include "Allot (anag.)" , "Bikini, perhaps" , "Coral isle" , "Pacific coral island" , "land threatened by rising sea levels" .)

I've seen this clue in The Mirror, the King Feature Syndicate, the Penny Press, The Sun, The Independent and the Evening Standard.
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