Possible Clues:

• Gertrude Stein or Alice B. Toklas
• Suppose EC's left to house a migrant
• One who's left the country as a result of Old Father Time
• Person abroad once apt to be relocated
• Windows opening worry emigrant
• Brit abroad, say, subsequently headed off round Pennsylvania
• Windows system in decay -- someone not living at home?
• Former president receives a threat finally living in exile
• Émigré
• Old lover, man or woman who has moved abroad?