Possible Clues:

• Create effervescence
• Poke holes in a lawn
• Make soda water, e.g
• Oxygenise
• Make effervescent putting article on a tree that's shimmering
• Yeast is used to ____ dough
• Expand, as cake batter
• Put bubbles into
• Whip, as cream
• Use a rototiller on, say