Further thought about payment for service (15)
I believe the answer is:
reconsideration
'further thought' is the definition.
(considering something again)
'about payment for service' is the wordplay.
'about' becomes 're' (regarding).
'payment for service' becomes 'consideration' (consideration can mean a fee or payment).
're'+'consideration'='RECONSIDERATION'
(Other definitions for reconsideration that I've seen before include "Review of a decision" , "Act of rethinking" , "Fresh thinking required" , "Taking new direction" .)