Very surprised (9)
I believe the answer is:
astounded
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">very surprised</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 astounded that I've seen before include "Greatly surprised" , "Gobsmacked w" , "Knocked for six" , "disconcerted" , "Speechless" .)