Unintentional omission (9)
I believe the answer is:
oversight
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unintentional omission</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 oversight that I've seen before include "Shot giver due to unintentional omission" , "Mistake resulting from inattention" , "what supervisor has" , "Supervision - omission" , "error" .)