Brilliant, amazing (8)
I believe the answer is:
dazzling
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">brilliant</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">amazing</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for dazzling that I've seen before include "Shining intensely" , "Brilliant" , "Blinding" , "Amazingly impressive (like car headlights?)" , "Very bright, impressive" .)