Least explainable (7)
I believe the answer is:
eeriest
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">least explainable</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 eeriest that I've seen before include "beating stranger" , "Strangest" , "Most ghostly" , "Weirdest, I.e., trees are wierd" , "Most weird" .)