A county going after prize turned over huge sum of money (9)
I believe the answer is:
megabucks
'money' is the definition.
(I know that megabucks is a type of money)
'a county going after prize turned over huge sum' is the wordplay.
'a county' becomes 'bucks' (I've seen this before).
'going after' means one lot of letters go next to another.
'prize turned over huge sum' becomes 'mega' (I can't justify this - if you can you should give a lot more credence to this answer).
'bucks' after 'mega' is 'MEGABUCKS'.
'of' is the link.
Can you help me to learn more?
(Other definitions for megabucks that I've seen before include "Loads of money" , "Vast sums of money" , "Many grand" , "Huge money" , "large sum of money" .)