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Santa lives here, very jolly! (2,3,2,3,5)

Ross

I believe the answer is:

on top of the world

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If this is the answer, I'm afraid I cannot explain it.

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(Other definitions for on top of the world that I've seen before include "as Hillary once was?" , "Penguins aren't" , "happy" , "Delighted" , "In seventh heaven" .)

I've seen this clue in the Sydney Morning Herald.
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