See you gave Spooner's lackey gratuity (6-3)
I believe the answer is:
toodle-pip
I'm afraid I can't explain this answer.
Can you help me to learn more?
(Other definitions for toodle-pip that I've seen before include "Take care" , "Goodbye (dated)" , "so long" , "Farewell remark - dipole top (anag)" , "Farewell (informal)" .)