Crossword Genius

See you later! (informal) (6-2)

Ross

I believe the answer is:

toodle-oo

(Other definitions for toodle-oo that I've seen before include "Farewell (old inf.)" , "Bye!" , "Cheerio" , "Goodbye (dated)" , "Bye-bye!" .)

I've seen this clue in The Guardian.
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