Crossword Genius

Kombucha ingredient (5)

Ross

I believe the answer is:

yeast

(Other definitions for yeast that I've seen before include "Fungus able to convert sugar into alcohol" , "Fungus used in fermenting" , "Alcohol-producing fungus" , "What makes bread rise" , "Fungus; food supplement" .)

I've seen this clue in the USA Today.
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