Crossword Genius

Thickener used in desserts (4)

Ross

I believe the answer is:

agar

(Other definitions for agar that I've seen before include "Seaweed jelly" , "Medium for growth" , "Jelly used in bacteria culture" , "Food-thickening jelly" , "part of culture?" .)

I've seen this clue in The New York Times.
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