Related Clues:

• Whacked as boxer might be?
• Done in colour after wretched fellow rejected it
• Extremely weary
• Done in by the setter?
• Spent dreaming of rabbits?
• Setter perhaps tried to change, and became worn out
• Ready to drop, like a boxer?
• Completely worn out like Fido at the end of the day?
• Spent one's energy going walkies?
• In state of exhaustion catnap won't relieve?
• Totally worn out
• Spent completely
• Whacked like boxer?
• Boxer so shattered?
• Burned-out setter maybe attempted swapping couple of letters