State of tuba from Baton Rouge (6)

I believe the answer is:

oregon

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

'state of tuba from baton rouge' is the definition.
'oregon' can be an answer for 'state' (Oregon is an example). I'm not sure about the 'of tuba from baton rouge' bit.

'state of tuba' is the wordplay.
'state' becomes 'or'.
'of tuba' becomes 'egon' (I can't explain this - if you can you should give a lot more credence to this answer).
'or'+'egon'='OREGON'

Can you help me to learn more?

(Other definitions for oregon that I've seen before include "Salem's state" , "Salem is this State's capital" , "US west-coast state" , "The American state is no goer, strangely" , "US NW coastal state" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.

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