Related Clues:

• With 61-Down, Pollux, e.g.
• Certain inbox filler
• Nuclear physics prefix
• In-box clutter, perhaps
• Computer in-box annoyance
• It's often deleted
• Gamma preceder
• Not-quite-final software
• Alpha-gamma connection
• Cyber-junk
• Net receipts?
• Second letter
• War fare?
• Bygone VHS alternative
• Foxhole entree