Reeled, amazed (9)
I believe the answer is:
staggered
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">reeled</span>' is the first definition.<br/ ><span class="explanation-format__explanation">('stagger' can be a synonym of 'reel')</span><br/ ><br/ >'<span class="explanation-format__original">amazed</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(staggering is a kind of amazing)</span><br/ ><br/ ></span>
(Other definitions for staggered that I've seen before include "Astonished" , "Did floor" , "Lurched, reeled" , "Bowled over" , "not to be starting together" .)