Wearing suits after a change of heart offends (7)
I believe the answer is:
insults
'offends' is the definition.
(insulting is a kind of offending)
'wearing suits after a change of heart' is the wordplay.
I cannot really see how this works, but
'wearing' could be 'in' (in jeans or in a dress) and 'in' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for insults that I've seen before include "Affronts" , "Rude remarks" , "Abusive remarks or acts" , "Abuses verbally" , "Offensive remarks" .)