Shopping cart unit (4)
I believe the answer is:
item
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">shopping cart unit</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for item that I've seen before include "One thing among many" , "Component" , "Particular" , "Single thing, poor mite" , "Also no more" .)