Possible Clues:

• Single payment
• Single amount of money in lieu of several
• Puts up with, I hesitate to say, single payment
• Single payment to self-employed workers for half a season
• Into chimney, 'eaves wad of cash
• Pension element, possibly chimney sweep's ultimate problem
• Recession beginning to end? Er... let's have a one-off payment!
• A singular lot of mint sauce?
• Large payment, often in cash
• House sitter in America placed in chimney one lot of money