Money made, paid well (6)
I believe the answer is:
profit
'money made' is the definition.
(I've seen this before)
'paid well' is the wordplay.
'paid' becomes 'pro' (I can't explain this - if you can you should believe this answer much more).
'well' becomes 'fit' ('fit' is associated in meaning with 'well').
'pro'+'fit'='PROFIT'
Can you help me to learn more?
(Other definitions for profit that I've seen before include "Gain, return on investment" , "Use" , "Advantage, benefit" , "Financial gain" , "returns" .)