Crossword Genius

Food thickener extracted from seaweed (4)

Ross

I believe the answer is:

agar

(Other definitions for agar that I've seen before include "Food-thickening jelly" , "Food thickener (derived from seaweed)" , "found in the sea" , "Jelly got from seaweeds, used in foods" , "setter" .)

I've seen this clue in The Guardian.
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