Condemnation of revolting disposition (4)
I believe the answer is:
doom
'condemnation' is the definition.
(I've seen this in another clue)
'revolting disposition' is the wordplay.
'revolting' says the letters should be written in reverse.
'disposition' becomes 'mood' (I've seen this in another clue).
'mood' back-to-front is 'DOOM'.
'of' acts as a link.
(Other definitions for doom that I've seen before include "Inescapable fate" , "Sentence" , "Fate; condemn to death" , "Fate; ruin" , "In disaster" .)