Glaring (5)
I believe the answer is:
lurid
'glaring' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for lurid that I've seen before include "Sensational or dazzling" , "Bright and garish" , "In glaring colours, shockingly vivid" , "Ghastly in appearance" , "Glaringly bright" .)