Related Clues:

• "___ Upon a Mattress"
• "__ I built a railroad ...": Depression song lyrics
• If ever
• Word on a sign on a lawn
• Fairytale beginning
• ''___ Two Can Play'' (Peter Sellers comedy)
• ___ in a lifetime
• None other than
• ''___ 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