Crossword Genius

Iodine source (4)

Ross

I believe the answer is:

kelp

'iodine source' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for kelp that I've seen before include "Algae" , "Tough brown seaweed" , "Large brown seaweed used for manure" , "Large seaweeds with leathery fronds" , "Large brown leathery seaweed" .)

I've seen this clue in the Penny Press.
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