Related Clues:

• Put a foot down
• Walked along
• Make impressions
• Philately specimen
• OK, in a way
• Stepped (upon)
• Refuse to budge
• Visa feature
• Was in debt
• Marched on
• Penny Black was the first one
• Post office purchase
• Won't take no for an answer
• Some vegans won't lick it
• Stamped