Sudden, striking (8)
I believe the answer is:
dramatic
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">sudden</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">striking</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for dramatic that I've seen before include "Substantial" , "Like play" , "Striking, impressive" , "spectacular" , "with eye-popping effect!" .)