Yellowstone and Yosemite (5)
I believe the answer is:
parks
'yellowstone and yosemite' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for parks that I've seen before include "Places temporarily" , "Recreational areas" , "Public spaces" , "Pieces of open land for recreational use" , "Phoenix, Green and Central" .)