Make a quick buck for, well, alway (9)
I believe the answer is:
profiteer
'make a quick buck' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'for well alway' is the wordplay.
'for' becomes 'pro' (I've seen this before).
'well' becomes 'fit' ('fit' is associated in meaning with 'well').
'alway' becomes 'eer' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'pro'+'fit'+'eer'='PROFITEER'
Can you help me to learn more?
(Other definitions for profiteer that I've seen before include "One making excessive gains from trading" , "insider trader?" , "Gain excessively from transactions" , "financial exploiter" , "Make money unfairly" .)