Related Clues:

• Reminder
• How actors respond
• At just the right time
• Perfectly timed
• Exactly when expected
• Well-timed
• Timely way to enter
• How orchestra musicians respond
• Timely
• At precisely the right moment
• With perfect timing
• When the script calls for it
• Punctual, as for a script
• Timed perfectly
• Help out on a line