Related Clues:

• ___ in a lifetime
• ''___ upon a midnight dreary ...''
• At an earlier time
• First word of ''The Raven''
• In other days
• When the time comes that
• Popular story starter
• Unrepeated
• Way back in time
• Between twice and never
• "Just this __"
• ''The Raven'' opening
• First word of many fairy tales
• ''Going ___, going ...''
• At a previous time