Very surprising (9)
I believe the answer is:
startling
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">very surprising</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for startling that I've seen before include "Surprising, shocking" , "Surprising or alarming" , "Alarming due to rattlings" , "Suddenly frightening" , "staggering" .)