Related Clues:

• Give permission
• Serve that doesn't count
• First word of a Beatles song title
• Do not stop
• Give permission to
• Leave
• Tennis judge's cry
• Ashe Stadium do-over
• Net judge's call
• Legitimate
• Voided shot
• Down or up preceder
• Tennis term
• Ball in the net, sometimes
• "___ freedom ring" (MLK quote)