Possible Clues:

• By the sound of it, misses 15 across
• One has an early mate, perhaps
• How much can one make of her figure at first?
• Female count
• Eminent lady writing tot a letter
• You may begin to depend on Mrs 15 across
• Olivia in 'Twelfth Night,' e.g.
• She starts to get the number of a peer
• Left from incalculable role in 'The Marriage of Figaro'
• The man for her might be an early one