Related Clues:

• Go no further
• Octagonal order
• Heed a red light
• Word on a red sign
• Period in English literature
• Lettuce unit
• Nail part
• Familiar sign
• Arresting word
• ''Hold the phone!''
• What you often do on the road
• See 48 Across
• ''Hold it!''
• Place to catch a bus
• Come to a standstill