Single manufactured item (4)
I believe the answer is:
unit
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">single manufactured item</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for unit that I've seen before include "One - kitchen cabinet" , "Kitchen fitting" , "detachment maybe" , "A single self-contained item" , "Entity, system; component group" .)