One of a list (4)
I believe the answer is:
item
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">one of a list</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 item that I've seen before include "Object in a list" , "Separate object or unit" , "partners" , "Report" , "Bit of information" .)