Noisy ghost (11)
I believe the answer is:
poltergeist
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">noisy ghost</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for poltergeist that I've seen before include "Disturbing ghost" , "Noisy ghost" , "Destructive spirit" , "Active ghost" , "Mischievous ghost" .)