Related Clues:

• Storybook starter
• '___ upon a time'
• Almost never?
• ___ upon a time
• Popular story start
• Immediately, after 'at'
• Fairy tale word
• Some years back
• ''--- bitten, twice shy''
• Never again?
• Yarn opener
• Start of a Susann title
• Twice halved
• "___ bitten . . ."
• Opportunity's frequency