Very shocked (6)
I believe the answer is:
aghast
'very shocked' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for aghast that I've seen before include "Horrified, appalled" , "Appalled, filled with consternation" , "Filled with fear and consternation" , "Stunned" , "Deeply dismayed" .)