Home in a northern estate (4)
I believe the answer is:
nest
'home' is the definition.
(a bird's home)
'in a northern estate' is the wordplay.
'in' indicates the answer is hidden within the clue.
'NEST' is hidden within 'northern estate'.
(Other definitions for nest that I've seen before include "Structure for laying eggs" , "Structure to lay eggs" , "Bird's house" , "Something found in Chinese soup" , "Home to a bird" .)