Agatha's maybe robbed of an article, and shocked (6)

I believe the answer is:

aghast

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'shocked' is the definition.
(I know that shocked can be written as aghast)

I don't understand the rest of the clue.

(Other definitions for aghast that I've seen before include "Thunderstruck" , "Deeply shocked" , "Filled with terror" , "Stupefied with horror" , "struck with fear" .)

I've seen this clue in the Evening Standard.

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