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One rolling west to a part of Oregon? (5)

Ross

I believe the answer is:

wagon

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

'oregon?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'one rolling west to a part' is the wordplay.
'one rolling' says the letters should be written backwards.
'west' becomes 'W' (abbreviation).
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'part' becomes 'gon' (I am not sure about this - if you are sure you should believe this answer much more).
'w' put after 'a' is 'aw'.
'aw' reversed gives 'wa'.
'wa'+'gon'='WAGON'

'of' is the link.

Can you help me to learn more?

(Other definitions for wagon that I've seen before include "Cart; rail truck" , "Vehicle (on which abstainers travel?)" , "Four-wheeled goods vehicle" , "Van, lorry" , "Trailer, railway truck" .)

I've seen this clue in the Evening Standard.
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