Crossword Genius

Gelatinous substance derived from seaweed and used to thicken ice cream (4)

Ross

I believe the answer is:

agar

(Other definitions for agar that I've seen before include "Food-thickening jelly" , "setter" , "Jelly used in bacteria culture" , "a newspaper rejected" , "Food thickening agent obtained from seaweed" .)

I've seen this clue in The Independent.
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