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 all the 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 Mirror, the Sydney Morning Herald, The Star Tribune, The Telegraph, the Newsday, the King Feature Syndicate, The Times and the Universal.
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