Related Clues:

• Loss through emigration
• Unwanted loss of intellectual workers
• Loss of skilled personnel
• High-level personnel loss
• Result of a professor's departure?
• Intellectual exodus
• Flight of scientists to another nation, e.g.
• Mass exodus of expertise
• Drift of stuff that is grey or black, leading to repeated precipitation around break of day
• Emigration of well-educated people
• Intelligentsia's emigration
• Mind blowing perhaps for intellectual to withdraw
• Emigration of talent
• Diminishing intelligence seen as a national problem
• Bishop died during lots of bad weather, such a loss of talent