Possible Clues:

• Tariff payer
• Mine's a Guinness. Get it in, will you
• Mine's a Guinness and I'll get it in
• International trader, I am to take on carrier
• Mine's a Guinness: here's someone to get it in
• Mine's a Guinness, so I carry on with it
• Mine's a Guinness; I'll get it in
• Claim to be songwriter, one bringing in goods
• Carry your bag, sir, and mine's a Guinness
• Mine's a Guinness - I get it in