Crossword Genius

Underwater ridge (4)

Ross

I believe the answer is:

reef

'underwater ridge' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for reef that I've seen before include "Coral-ridge" , "endangered habitat" , "Take in (part of sail)" , "Rock in shallow water" , "Rocky ridge near sea surface" .)

I've seen this clue in The Telegraph and The Independent.
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