Shock, startle (5)
I believe the answer is:
amaze
This clue is a double definition.
'shock' is the first definition.
(I've seen this before)
'startle' is the second definition.
(I've seen this before)
(Other definitions for amaze that I've seen before include "wow!" , "Floor" , "baffle" , "Affect with wonder" , "Stagger" .)