Possible Clues:

• Change of state as floor revolts before speech
• Girl with quiet speech drying up
• Return to cover sermon on a way the state changes
• Process of a substance changing into vapour
• Drying floor the wrong way leads to lecture
• Process of losing moisture
• One way that water can get into the atmosphere
• Cover ground after rousing talk that could make one dry up?
• Do roadwork (spelled backward) + Speech = ?
• The turning of liquid to vapour