Defrayal (7)
I believe the answer is:
payment
'defrayal' is the definition.
(I know that defrayal can be written as payment)
This is all the clue.
(Other definitions for payment that I've seen before include "Recompense, reward" , "Discharge of an obligation with money" , "Money (for goods)" , "Sum of money handed over" , "Purchase price" .)