Possible Clues:

• A score against self, as by soccer player
• Goon law (anag.)
• Accidental score against oneself or one's team
• Have objective that aids the opposition
• Self-inflicted penalty as may occur in soccer
• (Soccer) score which helps opposing team
• Have ambition? One may get back embarrassed
• A self-inflicted injury, from soccer
• Have objective that could be self-defeating
• Self-inflicted disadvantage, from soccer