GI teleports wicked ghost (11)
I believe the answer is:
poltergeist
'ghost' is the definition.
(I know that poltergeist is a type of ghost)
'gi teleports wicked' is the wordplay.
'wicked' indicates an anagram.
'gi'+'teleports'='giteleports'
'giteleports' is an anagram of 'POLTERGEIST'.
(Other definitions for poltergeist that I've seen before include "Mischievous spirit" , "Mischievous ghost" , "Disturbing ghost" , "Ghost that makes strange noises and disorders furniture" , "Destructive spirit" .)