Possible Clues:

• Away from home bet there will be expenses
• Cost borne by unpopular amateur
• Expenditure needed to win the Bricklayers' Championship?
• The cost of eggs not deposited in the nesting box
• One might make an entry for how the cash is going out (6)
• Excel in egg production? There's a cost
• Cost of providing alfresco spread
• Is this what one has had to spend on the confused lout? Yes
• Start-up costs
• Money needed upfront to be top egg producer?