Insult, affront (6)
I believe the answer is:
offend
I believe this clue is a double definition.
'insult' is the first definition.
(I know that insult is a kind of offend)
'affront' is the second definition.
(I've seen this before)
(Other definitions for offend that I've seen before include "Commit an illegal act" , "Affront - break the law" , "Outrage" , "cause displeasure or do wrong" , "Annoy - upset" .)