Related Clues:

• A shot might indicate it
• Proctor’s instruction
• Git-go
• Where to begin
• First stage
• Get to work
• Crank up
• Take step one
• Maze entrance word
• "Boo!" reaction
• First square of some board games
• Sudden movement
• One maze terminal...
• Be part of the opening lineup
• Word next to an arrow, maybe