Related Clues:

• Key buried by Aberdeen terrier
• Answer to one knocking perhaps — a key
• Wide key
• Verbal invitation
• Key key?
• Sign on many doors
• Reply to knocking
• Log in
• Penetrate middle of America, although no Conservative
• Filter through food father in Paris holds
• Some recent errors in attendance register
• Put down log
• Some recent errors in the register
• Diffuse, as mate pre-arranged with last bottle
• Start to penetrate