Related Clues:

• Word with "ball" or "language"
• Service provider's base error
• Disgusting breach of sporting etiquette
• Unfair tackle
• Use the wrong sort of tackle, perhaps
• Service provider's basic error?
• One of six allowed to an N.B.A. player
• It's distasteful to offend Oxford College
• Basketball no-no
• Kind of tip, in baseball
• Type of ball or language
• Offensive; make dirty
• Batted ball into the dugout, say
• It may precede a free throw
• Cause of a free throw, often