Related Clues:

• Prefix with 'while'
• It may come before a while?
• "While" lead-in
• 'The even mead, that ___ brought sweetly forth ...': 'Henry V'
• In the past, once
• Archaic attachment to "while"
• Once, a long time ago
• Lead-in for while
• Formerly, archaically
• Attachment to "while"
• Previously archaic?
• Rest turned formerly
• Previously when there's warning on the links
• Previously 12 across, perhaps
• Previously, this might be when one was in danger of course (9)