Related Clues:

• Hint for erring actor?
• Feed a line
• Stick in a ball-and-stick game
• Sign left out of what you’re reading
• Potter's signal?
• People in line for audience must be prompt
• Tool at the table
• Acting signal
• Phone ringing onstage, perhaps
• It could be a mere nod
• Prompt line heard
• Word before "card" or "stick"
• Ham's helper
• 'That's my ___!'
• Help in the theater