Brilliant, amazing (8)
I believe the answer is:
dazzling
This clue is a double definition.
'brilliant' is the first definition.
(I've seen this in another clue)
'amazing' is the second definition.
(synonyms)
(Other definitions for dazzling that I've seen before include "Shining intensely" , "Brilliant" , "Blinding" , "Amazingly impressive (like car headlights?)" , "Very bright, impressive" .)