Gruesome, ghastly (7)
I believe the answer is:
macabre
This clue is a double definition.
'gruesome' is the first definition.
(both can mean morbid or disturbing)
'ghastly' is the second definition.
(I know that ghastly can be written as macabre)
(Other definitions for macabre that I've seen before include "'Grisly, gruesome (7)'" , "Gruesome, morbid" , "'Sinister, gruesome (7)'" , "Ghostly appearance" , "'Grim, repellent (7)'" .)