Related Clues:

• Guardian at the gate
• Watchful one
• One on guard
• ''Who goes there?'' asker
• Soldier on guard
• Doorkeeper
• St. Peter, e.g.?
• Military lookout
• Ever-vigilant sort
• Door tender
• Checkpoint figure
• Sentinel
• Entrance attendant
• One whose speech is halting?
• Look-out, guard