Related Clues:

• Constraint
• Tennis redo
• Give the green light to
• Allow to happen
• Admit, with ''on''
• -- it slide
• Bad service
• Net grazer
• Divulge, with ''out''
• Grant permission to
• Cut back?
• U.S. Open do-over
• ___ by (allow to pass)
• Dropped service?
• "__ at 'em!"