Shock with content of fascist unorthodoxy (4)
I believe the answer is:
stun
'shock' is the definition.
('stun' can be a synonym of 'shock')
'content of fascist unorthodoxy' is the wordplay.
'content of' indicates a hidden word.
'STUN' can be found hidden inside 'fascist unorthodoxy'.
'with' acts as a link.
(Other definitions for stun that I've seen before include "Numb with nuts" , "Daze, scatter senses" , "Knock out temporarily" , "Nuts (anag)" , "Confound" .)