Related Clues:

• No sister could be better than she, by the sound of it
• No-one sounds so good as your sister
• There's no-one so sound as sister
• Breast-feed
• Convent head
• Parochial school figure
• Many a rosary carrier
• Religious woman
• Betty, in a movie title
• Feed one's baby sister, perhaps
• Sister in a convent
• OR or ER staffer
• Poor Clares member
• Sister wearing a habit
• Convent person