Unlisted cast were offended (8)
I believe the answer is:
insulted
'offended' is the definition.
(insulting is a kind of offending)
'unlisted cast' is the wordplay.
'cast' is an anagram indicator (letters are dispersed or cast around).
'unlisted' is an anagram of 'INSULTED'.
'were' is the link.
This may not be correct. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for insulted that I've seen before include "treated with scornful abuse" , "Spoke rudely or abusively to" , "Affronted" , "Offended" , "Treated with contempt" .)