Possible Clues:

• Substance added to dough to make it rise
• Lighten up
• Ferment in Zion? Change the leader for Liberal
• Cause dough to rise
• Substance that makes dough ferment
• Do what yeast does
• Abandon Beethoven's Ninth in ferment
• Quit application, finally causing ferment
• Get out of somewhere for new start and for a better rise
• Use yeast on