Crossword Genius

Mickey Mouse's contribution to the solar system? (5)

Ross

I believe the answer is:

pluto

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

'solar system?' is the definition.
(thesaurus)

'mickey mouse's contribution to' is the wordplay.
I cannot really understand how this works, but
'to' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

'the' acts as a link.

Can you help me to learn more?

(Other definitions for pluto that I've seen before include "Planet - cartoon dog - God of the Underworld" , "Ninth planet of solar system" , "It used to be a planet" , "recently losing status within star system" , "Dog star" .)

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