Related Clues:

• Back in the day, back in the day
• Formerly, arch
• Formerly, quaintly
• What might take a while?
• Prefix for "while," way back when
• Old prefix with "while"
• In olden days, once
• Substitute neither first nor last at first
• Archaic 'once'
• Quaint "once"
• German "first"
• Sylvester Stallone's hiding at first
• Long ago, in the past