Zion National Park's state (4)
I believe the answer is:
utah
'zion national park's state' 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 "State of Western USA" , "A hut for the Mormons, oddly" , "State of the union" , "The "Beehive" State, capital Salt Lake City" , "A hut marks the State" .)