Amounts incurred in the performance of work (8)
I believe the answer is:
expenses
'amounts incurred in the performance of work' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for expenses that I've seen before include "Reimbursed money spent in the course of work" , "Reimbursed monies spent in the course of work" , "Costs incurred in the performance of one?s job" , "Outlays" , "Amounts incurred in the performance of work" .)