Crossword Genius

Cause to rise by adding yeast, eg (6)

Ross

I believe the answer is:

leaven

(Other definitions for leaven that I've seen before include "Substance for producing fermentation" , "Substance that produces fermentation in dough" , "Yeast or other raising agent" , "Ferment, raise" , "Cause dough to rise" .)

I've seen this clue in The Times.
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