Crossword Genius

Underwater forest (4)

Ross

I believe the answer is:

kelp

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

This is all the clue.

(Other definitions for kelp that I've seen before include "Tough brown seaweed" , "Large seaweeds with leathery fronds" , "Type of finch" , "Large brown leathery seaweed" , "Brown seaweed with fluted leathery fronds" .)

I've seen this clue in The New York Times.
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