Related Clues:

• Gives a signal
• Reacts to a long speech, maybe
• OKs you can't hear
• Affirmative actions?
• Grows sleepy
• Some responses
• Signals OK
• Head-shaking answers
• Consenting responses
• Gives a heady reply?
• Compliant words
• Words of submission
• Signs an agreement?
• Silent answers
• ''For'' words