Dwarf planet beyond Neptune (4)

I think it could be either:

Which length description are you looking for?:

pluto

'dwarf planet beyond neptune' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for pluto that I've seen before include "Ninth planet of solar system" , "Disney dog - planet" , "Infernal ruler" , "Solar system body" , "Long-haul destination" .)

I've seen this clue in the USA Today.

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