Related Clues:

• See 12 Down
• Black piano keys, familiarly
• They don't laugh when they're tickled
• Keys of music
• Informal piano keys - tickle them
• Tinkle them on the piano
• Piano's 36, familiarly
• Keys for a music room?
• Trees used for making piano keys
• Black piano keys, informally
• The teeth of four Conservatives, when short of time!
• Climbers crossing outer bounds - they may be tickled
• Keys at a bar, perhaps
• Keys that may be tickled
• Sounds like these are key, but just the black ones