Noisy ghost (11)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
poltergeist
'noisy ghost' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for poltergeist that I've seen before include "Disturbing ghost" , "Noisy ghost" , "Destructive spirit" , "Active ghost" , "Mischievous ghost" .)