Pay some more money for it (5)
I believe the answer is:
remit
'pay' is the definition.
(remitting is a kind of paying)
'more money for it' is the wordplay.
'more money' becomes 'remi' (I can't explain this - if you can you should give a lot more credence to this answer).
'for' is a charade indicator (letters next to each other).
'it' becomes ''t' (abbreviation. e.g. in 'tis).
'remi'+'t'='REMIT'
'some' acts as a link.
Can you help me to learn more?
(Other definitions for remit that I've seen before include "send money, maybe" , "Job specification" , "Scope of reference" , "Maybe suspend" , "Task/area assigned (to an organisation)" .)