She was ruined by Ernie (5)
I believe the answer is:
Here is my best explanation:
'she' is the definition.
(I've seen this before)
'ruined by ernie' is the wordplay.
'ruined by' indicates anagramming the letters.
'ernie' with letters rearranged gives 'IRENE'.
'was' is the link.
(Other definitions for irene that I've seen before include "US actress, -- Dunne", "Girl's name (meaning Peace)", "The girl of peace", "Girl of peace", "Goddess of peace - Byzantine ruler", "Representative of peace", "Greek goddess of peace (English name)", "In Greek mythology, the goddess of peace", "Female name" and "Greek godess of peace".)