Related Clues:

• Stage prompt
• Solver's aid
• Actors wait for it
• Mnemonic device
• Game with Mustard and Plum
• Very small amount
• Charades gesture, e.g.
• Crossword staple
• Actor activator
• Conductor's signal
• Shuffleboard stick
• Kind of card or stick
• Memory jogger
• Whodunit item
• Signal to enter