Go and spoil (4)
I believe the answer is:
turn
I believe this clue is a double definition.
'go' is the first definition.
(synonyms)
'spoil' is the second definition.
(thesaurus)
'and' acts as a link.
(Other definitions for turn that I've seen before include "Go; reverse" , "Go; spin (cricket)" , "Move around an axis, or change" , "change for Autumn" , "Revolve; act" .)