The indignant take it as a violation (7)
I believe the answer is:
offence
This clue is a double definition.
'the indignant take it' is the first definition.
(someone might indignantly take offence)
'a violation' is the second definition.
(synonyms)
'as' is the link.
(Other definitions for offence that I've seen before include "Peccadillo" , "misdemeanor" , "Displeasure" , "Hurting of feelings" , "illegality" .)