Noisy spirit (11)
I believe the answer is:
poltergeist
'noisy spirit' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for poltergeist that I've seen before include "Destructive spirit" , "Mischievous spirit" , "Noisy ghost" , "Active ghost" , "Disturbing ghost" .)