Take action against core set-up that goes wrong (9)
I believe the answer is:
prosecute
'take action' is the definition.
(prosecuting is a kind of taking action)
'against core set-up that goes wrong' is the wordplay.
'against' is a charade indicator (letters next to each other).
'that goes wrong' is an anagram indicator.
'core'+'set'='coreset'
'coreset' put after 'up' is 'upcoreset'.
'upcoreset' is an anagram of 'PROSECUTE'.
(Other definitions for prosecute that I've seen before include "Represent the Crown in court" , "Sue" , "Carry out assessment" , "Take legal action" , "Pursue" .)