Holm oak changed a state in US (8)

I believe the answer is:

oklahoma

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'state in us' is the definition.
'oklahoma' can be an answer for 'state' (Oklahoma is an example). I'm not sure about the 'in us' bit.

'holm oak changed a' is the wordplay.
'changed' indicates anagramming the letters.
'holm'+'oak'='holmoak'
'holmoak' is an anagram of 'oklahom'.
'oklahom'+'a'='OKLAHOMA'

Can you help me to learn more?

(Other definitions for oklahoma that I've seen before include "Stage production" , "A holm oak found over in the States" , "Young woman" , "seen by many on stage" , "US State and musical drama" .)

I've seen this clue in The Sun.

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