Brought to ruin (6)
I believe the answer is:
undone
'brought to ruin' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for undone that I've seen before include "Reversed" , "Annulled; untied" , "Not finished; untied" , "Not finished; ruined" , "Unfastened or brought to ruin" .)