Related Clues:

• Mrs. Peacock's game
• La gniappe
• Footprint or thumbprint, perhaps
• Leave a little extra
• It may be 20%
• Detective's discovery
• Puzzle part
• Whodunit plot element
• Baksheesh
• Piece of advice
• See 38-Down
• Trackside offer
• Answer's opposite
• Crossword puzzle?
• Good lead