Finally retired, Bill has houses in the country (6)
I believe the answer is:
dachas
'houses in the country' is the definition.
'dachas' can be an answer for 'houses' (dacha is a kind of house). I am not sure about the 'in the country' bit.
'finally retired bill has' is the wordplay.
'finally' indicates one should take the final letters.
'bill' becomes 'ac' (short for account).
The final letter of 'retired' is 'd'.
'd'+'ac'+'has'='DACHAS'
Can you help me to learn more?
(Another definition for dachas that I've seen is " Russian country cottages used as summer houses".)