It's north of Arizona (4)
I believe the answer is:
utah
'it's north of arizona' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for utah that I've seen before include "US state N. of Arizona" , "member of union" , "Brigham Young's state" , "A hut for the Mormons, oddly" , "Mormon US state" .)