Cut regular trousers short, back in Nashville for American Idol (5,5)

'american idol' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'cut regular trousers short back in nashville' is the wordplay.
'cut regular' becomes 'norma' (I can't justify this - if you can you should give a lot more credence to this answer).
'trousers' becomes 'jeans' (denim trousers).
'short' means to remove the last letter.
'back in' says to take the final letters (the 'back' of the word).
The last letter of 'nashville' is 'e'.
'jeans' with its last letter taken away is 'jean'.
'norma'+'jean'+'e'='NORMA JEANE'

'for' acts as a link.

Can you help me to learn more?