Crossword Genius

Reef material (5)

Ross

I believe the answer is:

coral

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">reef material</span>' is the definition.<br/ ><span class="explanation-format__explanation">(material making up a coral reef)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for coral that I've seen before include "Basis of reefs" , "Tiny animal forming reef" , "Marine substance, often forming reefs" , "Basic material of South Sea islands" , "Hard substance on the seabed" .)

I've seen this clue in The Telegraph, The Star Tribune, the Newsday, the King Feature Syndicate, the Sydney Morning Herald, the Universal, The Times and The Mirror.
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