Possible Clues:

• Dip in liquid
• A concession or bribe, once offered to Cerberus
• A concession or bribe as to Cerberus
• Piece of bread dipped in liquid, or a concession
• Therefore pawn gets a bribe
• Ee! That would make the bribe sound fabulous
• Bread dipped in gravy
• Use a paper towel
• Thus 13 across may be a bribe
• Get all the sauce