Possible Clues:

• Advanced instruction from Red China toughie garbled
• Category for this grid's top three rows, but not its bottom row
• 8 across provides work for 25 across on the course to The Enlightenment
• Optional learning
• What college provides
• In which fellows can provide help to a degree?
• College studies, collectively
• Classes for airline employees?
• Duke's domain
• One's up in it, to a degree