Possible Clues:

• Get rid of old car in tip
• Waste paper - cash can be made from it
• Tip to get rid of old car
• Dump old crate here
• Row with Uriah being called a load of rubbish
• Spare chap deployed where he's no longer any use
• Perhaps a rubbish store for cast-offs, primarily?
• Where paper cash may be thrown eventually?
• Paper cash exchanged for pile of junk
• Place for obsolete metal and paper cash in circulation