Astound, shock (5)
I believe the answer is:
amaze
I believe this is a double definition.
'astound' is the first definition.
(I know that astound can be written as amaze)
'shock' is the second definition.
(I've seen this before)
(Other definitions for amaze that I've seen before include "Bowl over" , "Stupefy" , "Flummox" , "Greatly surprise, astound" , "Affect with wonder" .)