Related Clues:

• Billiards blunder
• What an X may indicate
• Baseball statistic
• Big-time mistake
• Boot in the field
• Dropping the ball, e.g.
• Accident cause, often
• Big mistake
• Trial's companion
• Spell of forgetfulness
• Blockheaded blunder
• "File not found," for example
• Dropping the ball, so to speak
• Bug, perhaps
• Run out, as subscriptions