Replace mid-terrace with home in the country — it's about money (7)
I believe the answer is:
finance
'money' is the definition.
(finance is the management of money)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for finance that I've seen before include "Supply funds" , "Fund" , "Monetary support" , "See 9" , "Money matters" .)