Possible Clues:

• Pianist Dame Hess
• ''___ Breckenridge''
• Female stipendiary magistrate turning over cases
• '___ Breckinridge' (Gore Vidal novel)
• Actress Turley of "Mad Men"
• Name that anagrams to "Mary"
• Gore Vidal's '___ Breckinridge'
• Soprano Merritt
• Woman's name that becomes another woman's name when its vowels are switched
• Dame -- Hess, 1890-1965, English pianist