50 per cent (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">50 per cent</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 half that I've seen before include "50 per cent" , "shared round" , "alcoholic drink" , "Short distance - steal!" , "0.5" .)
(Other definitions for semi that I've seen before include "Type of house (UK) - type of truck (US)" , "One of two houses with a common wall" , "Not quite the biggest tie" , "The last but one round" , "Co-joined house" .)