Possible Clues:

• Post office purchase
• Good man, a chemist, creates an impression
• Collectors' items for the post
• Give them stick as one puts one's foot down
• Makes impressive preparations for the send-off
• Makes an impression on with one's collection?
• Brings foot down heavily onto the ground
• Puts the foot down hard, in temper perhaps
• Brings foot down heavily
• Letter attachments