Possible Clues:

• Zestful
• Frothy — insubstantial
• Frothy, as dough
• Like taste of home brew, perhaps, giving endorsement with pen
• Turbulent, restless; fermenting
• Like a brewery
• Insubstantial point spanning the years
• In perhaps wise surroundings the East is bubbling
• Yes going by dirty place that's frothy
• Like bread starter