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Rev Spooner's dog-end so long? (6-3)

Ross

I believe the answer is:

toodle-pip

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'so long?' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

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

I've seen this clue in The Sun.
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