Tail of dog, Spooner tells us, is so long!

I believe the answer is:

toodle-pip

I'm a little stuck... Click here to teach me more about this clue!

(Other definitions for toodle-pip that I've seen before include "Farewell remark - dipole top (anag)" , "Goodbye (dated)" , "Take care" , "so long" , "Farewell (informal)" .)

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.