Related Clues:
- Knocks softly
- Military lights-out tune
- Doesn't pound hard
- Strikes lightly; eavesdropping devices
- Lightly strikes penalty?
- Thread cutters' strikes
- Jack to some extent despatched bugs
- Four-note piece
- Army bugler's tune
- Camp lullaby
- Shortly, what central heating will reveal knocks?
- Knocks gently
- Thankyou note asks for money
- Bugs (wire)
- Blows hot and cold?