Crossword Genius

Organism causing fermentation (5)

Ross

I believe the answer is:

yeast

'organism causing fermentation' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for yeast that I've seen before include "Fungus used to ferment sugar" , "Brewer's agent" , "Brewing agent" , "that baker needs" , "Rising agent" .)

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