Related Clues:

• Nod, at auctions
• Flag, maybe
• A wink or a nod, e.g.
• Wave, e.g.
• Cue
• Pair of lamps, maybe
• Be a polite driver, in a way
• Indicate silently
• Beacon
• Hardly comedic
• It stops traffic
• Flag or flare, perhaps
• Wave or wink
• Flag or flare
• Nod or wink