Related Clues:

• Jerusalem singers pop back for a sneaky listen
• Eavesdropping group of women upset dad
• Eavesdrop as waiter, moving around quietly
• Wrap tie in a knot for cloak-and-dagger arrangement?
• Eavesdrop on a telephone conversation
• Secretly listen to Western pirate broadcast
• Invasive bug
• Surveillance staple
• Retiring old man, one with bug
• Pat Weir designed surveillance device
• Put bugs in someone's home
• Bug with a sting?
• Evidence-gathering device
• A concealed recording or listening device
• Eavesdrop, in a way