Related Clues:

• With 61-Down, Pollux, e.g.
• Sampler, of a sort
• Showroom car, e.g.
• Nuclear physics prefix
• Dealer vehicle
• Gamma preceder
• Salesman's vehicle
• Not-quite-final software
• Alpha-gamma connection
• Second letter
• Tape for a music exec
• Showroom sample
• Try it out
• Bygone VHS alternative
• Test version of software