Possible Clues:

• One making big effort to produce a riddle?
• Riddle of second coach
• Colander’s kin
• Holey utensil
• Filtering device
• Small shoe that's full of holes
• Riddle of diamonds finally found on coach
• Some top running shoe is full of holes and the water just runs through it
• Device made of crossed wires for separating solid matter from liquid
• On the way to getting drunk, leaves stick here