Gobsmacked Attorney General laughs with Tasmanian leader (6)

I believe the answer is:

aghast

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'gobsmacked' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs sometimes define each other.

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(Other definitions for aghast that I've seen before include "Appalled, shocked" , "Very unhappy" , "Horrified, appalled" , "Horrified, filled iwth consternation" , "in awe" .)

I've seen this clue in the Sydney Morning Herald.

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