Possible Clues:

• Sort of insect in grain container
• Having pennies to save, one desiring container
• Container for a flea?
• Funnel (eg, feeding grain to mill)
• It's bound to be a reservoir for fleas
• It's bound to contain something
• One-legged jumper?
• Drawing site
• Container, jumper
• What brings grist to the mill? Cricket, perhaps