Related Clues:

• Billy Budd's affirmatives
• Assents noiselessly
• Misses part of the lecture, perhaps
• Calls for passage
• Thumbs-ups
• Endorsements
• Salty assents
• Nays' undoers
• Side for passage
• Apt anagram for "yeas"
• Indicates it's OK
• Assents, in a way
• Subtle signals
• Shows approval
• Unspoken okays