Related Clues:

• Respond to a bad call, maybe
• Word to a villain
• Shout to a hiccuper
• Bad sound at a campaign rally
• Disagree with a call, perhaps
• Cause of a scare
• Ghost line
• See 24 Across
• "Eek!" preceder
• Startling announcement?
• Fan's verbal thumbs-down
• October 31 shout
• Jeering cry
• Jump start?
• Rebuke from a fan