Possible Clues:

• Elector nearly suppressing a vote for strike-breaker?
• Wooden-handled iron tool with a curved head, pointed at both ends
• Tool to break rocks
• Choose times to enter A&E, which may cause rocky break-up
• Heavy tool with wooden handle and curved head
• Ground-breaking tool
• Heavy wooden-handled tool used in digging
• Select times for admission to A&E? That's ground-breaking!
• Tool with a wooden handle and a heavy curved metal head
• Single out with guitar that's groundbreaking