Residence in Home Counties, next to motorway (4)
I believe the answer is:
semi
'residence' is the definition.
(I've seen this before)
'home counties next to motorway' is the wordplay.
'home counties' becomes 'se' (Home Counties in the South East of England).
'next to' is a charade indicator (letters next to each other).
'motorway' becomes 'MI' (resembles M1, English motorway).
'se'+'mi'='SEMI'
'in' is the link.
(Other definitions for semi that I've seen before include "House attached to one other" , "One house of pair" , "House joined to another" , "Connected house" , "Style of house" .)