House type (4)
I believe the answer is:
semi
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">house type</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for semi that I've seen before include "match, the last but one?" , "Connected house" , "Property attached to another" , "Prefix meaning half (4)" , "Residence" .)