Crossword Genius

Bladderwrack, e.g. (7)

Ross

I believe the answer is:

seaweed

(Other definitions for seaweed that I've seen before include "Wrack" , "We eased (anag)" , "What's seen at the coast" , "Laver perhaps" , "Iodine source" .)

I've seen this clue in The Telegraph.
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