Related Clues:

• Patron of a sort
• Tweeter, say
• Rehab enrollee
• One with an ID
• Match in ability
• One to vie with
• Touchpad toucher
• Not a good friend
• Main competitor
• ___ testing (part of the beta stage)
• Avis, to Hertz
• Fischer, to Spassky, e.g
• Not a true friend
• Client of a sort
• Navratilova, to 45-Across, e.g