Related Clues:

• Indicates it's OK
• Assents, in a way
• Subtle signals
• Shows approval
• Unspoken okays
• Award nominations, e.g.
• Affirmations to pitchers
• 'Yes' signals
• Signals silently
• Auction assents
• Indicates yes
• Drifts (off)
• Dozes (off)
• Moves a head?
• Misses some of the lecture, perhaps