American term over with changes made around November (9)

'american' is the definition.
(Vermonter is an example)

'term over with changes made around november' is the wordplay.
I cannot really understand how this works, but
'over' could be 'on' (physically on top of) and 'on' is located in the answer.
an anagram of 'term' is 'ermt' which is within the left over letters.
The remaining letters 'ver' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?