Song describing cut-off area in US state (7)
I believe the answer is:
arizona
'us state' is the definition.
(state of the USA)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for arizona that I've seen before include "State of SW US" , "Western US state" , "Dry US state" , "American state, capital Phoneix" , "State of southwest USA" .)