Home of Arches National Park (4)
I believe the answer is:
utah
'home of arches national park' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for utah that I've seen before include "US state, capital Salt Lake City" , "Bryce Canyon US state" , "The American Mormon state" , "US state N. of Arizona" , "American state associated with Mormons and their faith" .)