Crossword Genius

Large seaweed with long, tough stalks (4)

Ross

I believe the answer is:

kelp

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

I've seen this clue in The Guardian.
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