Related Clues:

• "I didn't mean to do that" key
• Walk inside
• Take part in a contest
• Exit key of a sort
• Rogues leave tree surgeon to get in
• Tenant has no right to come in
• Put your name down to go in
• Backup key
• Often-pressed key
• PC "oops" key
• Neighbor of F1
• PC key for problem situations
• "Never mind" PC key
• With 23-Across, sign, as a contract
• PC getaway?