Related Clues:

• Straight up and down
• 'I know you're in there!'
• Be frank (with)
• Door pounder's demand
• Police order!
• Tool with a bubble
• Bare one's soul
• Tier
• Word with top (first-rate)
• Call from one knocking
• Police order
• Knocker's demand
• Horizontal
• Share one's feelings
• Like a pool table, ideally