Conflict rages sadly in exit (8)
I believe the answer is:
disagree
'conflict' is the definition.
(thesaurus)
'rages sadly in exit' is the wordplay.
'sadly' indicates anagramming the letters.
'in' indicates putting letters inside.
'exit' becomes 'die' ('die' can be a synonym of 'exit').
'rages' is an anagram of 'sagre'.
'sagre' going within 'die' is 'DISAGREE'.
(Other definitions for disagree that I've seen before include "Differ, argue" , "Dire ages (anag.)" , "Contradict" , "Beg to differ" , "source of conflict" .)