Possible Clues:

• Goodbye
• Goodbye (dated)
• Good-bye to old pipe - it's been replaced
• I'm off to old resort on northbound tube
• Farewell horrid lepidoptera: none seen for ages!
• Spooner's tail of dog - chow, we hear?
• Unduly led astray by star for so long
• Spooner's piece of advice for dog owner is so long
• Obscure old poet — one quiet for so long
• I'm going to take nothing from social security, good to be in work