Related Clues:

• Father, in Xhosa, and a nickname for 36-Across
• "I must be off, old chap"
• British "Bye-bye"
• Mobile message ender
• "Hasta la vista"
• ''Gotta run!''
• 'It's been real!'
• British "Bye-bye!"
• This extended farewell
• Repeated thanks given for so long
• Goodbye (colloq.)
• Thanks and cheerio
• Atomic Kitten's fond farewell
• Cheers and cheers for so long
• Thanks - and cheerio!