Related Clues:

• Rosetta __
• Castle-building material
• Director of 'JFK,' 'Nixon' and 'W.'
• Lake skipper?
• Subject that includes game theory
• With 42-Across, time of cavemen
• "Do the ___" (figure it out)
• See 5
• See 3
• See 1
• See 19
• See 21
• See 7
• See 23
• 9 square pitch