Crossword Genius

Coral formation (5)

Ross

I believe the answer is:

atoll

'coral formation' is the definition.
(I've seen this in another clue)

This is all the clue.

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

I've seen this clue in The Wall Street Journal.
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