Horrifying, sensational (5)
I believe the answer is:
lurid
This clue is a double definition.
'horrifying' is the first definition.
(thesaurus)
'sensational' is the second definition.
(similar in meaning)
(Other definitions for lurid that I've seen before include "Glaringly vivid and graphic" , "In glaring colours, shockingly vivid" , "Explicit" , "Horrifying - sensational" , "Shockingly sensational" .)