Something wanted (11)
I believe the answer is:
desideratum
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">something wanted</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for desideratum that I've seen before include "Essential" , "Something needed or wanted" , "Something much wanted" , "Something much needed" , "As requirement" .)