Related Clues:

• Bid silently
• Assent of a sort
• Exhibit drowsiness
• Wordless yes
• Assent silently
• Where Cain settled
• Bow to wear, twisted
• Sign of gratitude
• Wordless okay
• Bidder's subtle gesture
• Careless mistake member of teaching staff picked up
• Gesture of approval
• Indicate assent; make slip
• Be agreeably sleepy?
• A tight race can be won on this