Related Clues:

• Adjusted the pitch of, as a piano
• Signaled backstage, perhaps
• Adjusted a baby grand
• Like a purring Jaguar
• Helped a forgetful actor
• Ignored, with 'out'
• Au courant, with "in"
• Signaled on stage
• Sharpened, say?
• Prompted in a play
• Made less sharp
• No longer flat
• Adjusted the pitch of
• Of engine, adjusted to run properly
• Gave prompt to forgetful actor