House in Home Counties close to motorway (4)
I believe the answer is:
semi
'house' is the definition.
(short for semi-detached)
'home counties close to motorway' is the wordplay.
'home counties' becomes 'se' (Home Counties in the South East of England).
'close 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 "One house of pair" , "place" , "match, the last but one?" , "Prefix meaning half or partly" , "Residence" .)