Related Clues:

• Sandhurst send-offs
• Farewells
• Parting words
• Profs' helpers
• Univ. instructors
• Prof. helpers
• See 6-Down
• Letters from Greece
• Brits' thank-yous
• Intro-level class teachers, often
• A prof. may have them
• They're heard when Brits take off
• Brit's bye-byes
• Profs' help
• They're heard at Heathrow