Secure real estate (4)
I believe the answer is:
land
I believe this is a double definition.
'secure' is the first definition.
(land can mean to secure or obtain)
'real estate' is the second definition.
(I know that land is a type of real estate)
(Other definitions for land that I've seen before include "Acquire" , "See 5" , "Part of Germany" , "Come down to earth" , "Country, state" .)