Related Clues:

• Answer following a knock
• Tenant doesn't have right key
• Right-hand keyboard key
• Formal 'Door's open'
• Formal "Door's open"
• Go in emergency room below hospital department
• Some alien Terminators go inside
• Record not the first for Middle America?
• Go in chippy, wanting fish
• "New line" key
• Possible response to a knock
• "Come in"
• Shift key neighbor
• Participate in, as a drawing
• & 12 Across No danger here? Empty threat? Distorted picture