Unresolved detail (5,3)
I believe the answer is:
loose end
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unresolved detail</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 loose end that I've seen before include "'A detail not settled or explained (5,3)'" , "unfinished work" , "should have been tied?" , "As yet unexplained detail" , "Detail not yet settled" .)