Possible Clues:

• When doubled, Eva's sister
• When doubled, sister of Eva
• When repeated, a famous sister's first name
• Half-sister of Eva?
• Doubled, a Gabor
• When doubled, a much-married celebrity
• When repeated, one of the Gabor sisters
• Doubled, Paris Hilton's ex-step-great-grandmother Gabor
• Half a notable Hungarian?
• Hungarian half sister?