Small home (4)
I believe the answer is:
semi
'small home' is the definition.
(short for semi-detached; 'small' asks for an abbreviation)
This is the entire clue.
(Other definitions for semi that I've seen before include "House linked to another" , "Prefix meaning half or partly" , "House joined to another" , "Not quite the biggest tie" , "Property attached to another" .)