Related Clues:

• Break in
• "Abandon hope, all ye who ___ here"
• Punch in, as a PIN
• Choose to compete in
• Pass through
• Take part in
• Write in
• It may start a scene
• Neighbor of a shift key
• Alternative to "return" on a keyboard
• "Door's open"
• Submit for judging
• Pickup line?
• Make a formal record of
• Drive-thru sign