Related Clues:

• Elongated keyboard key
• Participate
• A.T.M. button
• Join the club
• Break in
• "Abandon hope, all ye who ___ here"
• Punch in, as a PIN
• Sign up for a class
• 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