Be suspicious of some nonconformist rusticated (8)
I believe the answer is:
mistrust
'be suspicious of' is the definition.
'some nonconformist rusticated' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'MISTRUST' is hidden within 'nonconformist rusticated'.
(Other definitions for mistrust that I've seen before include "Suspect (someone)" , "Lack of belief (in someone)" , "Regard with suspicion" , "reservations" , "Have doubts about" .)