Haunted house inhabitants (6)
'haunted house inhabitants' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ghosts that I've seen before include "Spirits or apparitions" , "Apparitions of a dead people" , "Spooks, spectres" , "Writes for another; Ibsen play" , "Spectres, wraiths" .)