Corrupt result of ruthless campaign? (5)
I believe the answer is:
spoil
'corrupt' is the definition.
(synonyms)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for spoil that I've seen before include "Deface" , "decompose" , "Earth from excavation" , "Booty" , "Harm or destroy" .)