Come down for real estate (4)
I believe the answer is:
land
This clue is a triple definition!
'come' is the first definition.
(landing is a kind of coming)
'down' is the second definition.
(synonyms)
'for real estate' is the third definition.
(land is a kind of real estate)
(Other definitions for land that I've seen before include "Come down; country" , "Gain" , "Property" , "Lift with ropes and pulleys" , "Capture" .)