Related Clues:

• Like soda that's been sitting out for too long
• What an a cappella singer never wants to be
• With no air, as a tire
• Precisely, in time
• Sharp’s counterpart
• You might take a lift to one
• Word with panel or screen
• It's not bubbly in large heavy bottles
• Like a tire that needs help
• Sharp counterpart
• Uninteresting place to live
• Like 9-Across that has lost its fizz
• Note seen in apartment
• ___ Stanley (traveler in an envelope)
• Totally horizontal