Crossword Genius

Lagoon's boundary (5)

Ross

I believe the answer is:

atoll

'lagoon's boundary' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for atoll that I've seen before include "Bikini, say" , "Allot (anag.)" , "land threatened by rising sea levels" , "Coral island surrounding a lagoon" , "String of islands" .)

I've seen this clue in the USA Today, the Penny Press, the Universal, The Star Tribune and the Family Time.
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