Agatha's maybe robbed of an article, and shocked (6)
I believe the answer is:
aghast
'shocked' is the definition.
(synonyms)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for aghast that I've seen before include "Thunderstruck" , "Deeply shocked" , "Filled with terror" , "Stupefied with horror" , "struck with fear" .)