Lurid, gaudy (6)
I believe the answer is:
garish
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">lurid</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">gaudy</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that gaudy can be written as garish)</span><br/ ><br/ ></span>
(Other definitions for garish that I've seen before include "Showy, lurid" , "Excessively bright, over-colourful (6)" , "Bright and showy" , "Crudely bright" , "Gaudy, lurid" .)