Related Clues:

• Who can come before it
• Answer to theme query, "Who's in there?"
• Word preceding more and lasting
• It precedes more and lasting
• Now or in the past
• Ad infinitum
• Even once
• From here to eternity
• 'As ___' (letter closing)
• Ending with 'for' or 'what'
• Partner of anon
• -
• '___ a Rock' (1966 hit)
• Who or when conclusion
• Now or in the future