Crossword Genius

Marine formation (5)

Ross

I believe the answer is:

coral

'marine formation' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for coral that I've seen before include "Pinkish-orange colour" , "certain islands" , "Creature building reef" , "Shade of pink" , "(Massed skeletons of) tiny invertebrate" .)

I've seen this clue in The Mirror and the Newsday.
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