Disruptive spirit (11)
I believe the answer is:
poltergeist
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">disruptive spirit</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 poltergeist that I've seen before include "Mischievous ghost" , "Destructive spirit" , "Troublesome ghost" , "Noisy spook" , "Disturbing ghost" .)