Possible Clues:

• Cost of swapping equal parts of design
• Money expended
• Expenditure not in place
• 'Ay, that's what it's going to cost the lout (6)'
• Unqualified support for public spending
• Expenditure in station previously disclosed
• Cost incurred switching parts of building plan?
• For cost, provide better return than other hens
• Cost better in egg production?
• Cost of turning geography around