House haunter (5)
I believe the answer is:
ghost
'house haunter' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ghost that I've seen before include "Author, secretly" , "Pen for another" , "Spectre, wraith" , "Visible manifestation of a dead person" , "Apparition; faint trace" .)