Vividly shocking (5)
I believe the answer is:
lurid
'vividly shocking' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for lurid that I've seen before include "Gloomily threatening" , "In shocking detail" , "Vividly shocking" , "Ghastly bright" , "In glaring colours, shockingly vivid" .)