Ruined but not executed? (6)
I believe the answer is:
undone
'ruined' is the definition.
(I know that ruined can be written as undone)
'not executed' is the wordplay.
'not' becomes 'un' (prefix meaning 'not').
'executed' becomes 'done' (execute can mean to do or accomplish).
'un'+'done'='UNDONE'
'but' is the link.
(Other definitions for undone that I've seen before include "Ruined or dismantled" , "Not bound" , "Ruined - no longer fastened" , "Reversed" , "Ruined; not tied" .)