'Shock and awe' upset rogue dissenting group (12)

I believe the answer is:

stupefaction

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'shock' is the definition.
(thesaurus)

'upset rogue dissenting group' is the wordplay.
'rogue' is an anagram indicator (letters go rogue).
'dissenting group' becomes 'faction' (I've seen this before).
'upset' anagrammed gives 'stupe'.
'stupe'+'faction'='STUPEFACTION'

'and awe' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.

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(Other definitions for stupefaction that I've seen before include "Total astonishment and shock" , "Extreme astonishment" , "Shocked astonishment" , "great astonishment" .)

I've seen this clue in The Guardian.

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