Crossword Genius

Reef invertebrate (5)

Ross

I believe the answer is:

coral

(Other definitions for coral that I've seen before include "Deep pink 11 across" , "Hard pink substance formed by skeletons of tiny sea creatures" , "Hard substance on the seabed" , "Reef material" , "Pinkish-red colour" .)

I've seen this clue in The Washington Post.
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