Daze, shock (4)
I believe the answer is:
stun
This clue is a double definition.
'daze' is the first definition.
(I know that daze can be written as stun)
'shock' is the second definition.
(both can mean to surprise)
(Other definitions for stun that I've seen before include "cause amazement" , "Stagger, amaze" , "Anaesthetise" , "Shock, flabbergast" , "Render insensitive" .)