Answer: leavening

AnswerCrossword Clue
LEAVENINGDough raiser.
LEAVENINGYeast.
LEAVENINGYeast, e.g.
LEAVENINGYeast role
leaveningto make (dough) rise with a leaven
leaveningLEAVEN, to produce fermentation in
leaveningfermenting agent to raise dough