Dislike upsetting Rose and Ivan (8)
I believe the answer is:
aversion
'dislike' is the definition.
(aversion is a kind of dislike)
'upsetting rose and ivan' is the wordplay.
'upsetting' is an anagram indicator.
'and' says to put letters next to each other.
'rose' put after 'ivan' is 'ivanrose'.
'ivanrose' is an anagram of 'AVERSION'.
(Other definitions for aversion that I've seen before include "serious dislike" , "Dislike, hatred" , "distaste" , "phobia" , "Hate" .)