Related Clues:

• Gummed receipts of postal fees
• Philatelists study them
• Brings one's foot down heavily on the envelope
• If one's got them underfoot, one may take a stick to them
• That comes to a sticky end underfoot
• Give them stick as one puts one's foot down
• One stands over them with a stick
• When it comes to mail one puts one's foot down
• Let 'er get to put 'er foot down
• Put your foot down on 6 across
• How one puts one's foot down to get the letter off
• By the sound of it, let 'er be posted when one puts one's foot down
• They get a stick on a post
• Let 'er have 'em on by the sound of 'em
• One puts one's foot down for them on the post