Met with certain changes making payment (10)
I believe the answer is:
remittance
'payment' is the definition.
(remittance is a kind of payment)
'met with certain changes' is the wordplay.
'with' means one lot of letters go next to another.
'changes' indicates an anagram.
'met'+'certain'='metcertain'
'metcertain' with letters rearranged gives 'REMITTANCE'.
'making' is the link.
(Other definitions for remittance that I've seen before include "Sending of money" , "Sum of money (sent in payment)" .)