Related Clues:

• Go after, as flies
• Sharp blow
• Knock out of the park
• Clock
• Powerful blow
• Hard-hitting team?
• Crushing blow
• Letters on some police jackets
• Hit flies?
• Hit, as a fly
• Nail, as a fly
• With 61 Down, repel
• Police-jacket letters
• De-bug?
• Fly's undoing