Crossword Genius

Coral reefs (6)

Ross

I believe the answer is:

atolls

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

This is the entire clue.

(Other definitions for atolls that I've seen before include "Ring-shaped coral reefs enclosing lagoons" , "Coral reef islands" , "Ring-shaped coral islands" .)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.
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