Small home (4)
I believe the answer is:
semi
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small home</span>' is the definition.<br/ ><span class="explanation-format__explanation">(short for semi-detached; 'small' asks for an abbreviation)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(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" .)