Possible Clues:

• That might make one tight and full of holes
• Colander, sieve
• Full of holes and wet in the rest
• Composer runs inside for device to catch leaves
• Riddle produced by school's head on coach
• Among the rest there's water that goes through it
• It's full of holes to get one tight
• ...the answer's a riddle!
• It won't hold water
• Kitchen utensil, surprisingly, isn't rare