Ghoulish (6)
I believe the answer is:
morbid
'ghoulish' is the definition.
(I know that ghoulish can be written as morbid)
This is the entire clue.
(Other definitions for morbid that I've seen before include "Diseased - gruesome" , "Inclined to dwell on unpleasant thoughts" , "Preoccupied with gloomy or unpleasant things" , "Ghoulish" , "Showing unhealthy interest in death" .)