Related Clues:

• It's hard to do with ink
• Where many work
• Remove, as errors
• Help the teacher, perhaps
• Clear from memory
• Where many strikes are called
• Clear tape
• Wipe the blackboard
• Backspace, perhaps
• Clean the blackboard
• Where telecommuters work, often
• Answering-machine button
• Clear, as a tape
• Comfortable (with)
• In familiar territory