Some getting upset with it in the old American park (8)
I believe the answer is:
yosemite
'american park' is the definition.
(US National Park)
'some getting upset with it in the old' is the wordplay.
'getting upset with' indicates anagramming the letters.
'in' indicates putting letters inside.
'the old' becomes 'ye' (resembles a historical spelling of 'the').
'some' mixed up with 'it' makes 'osemit'.
'osemit' going within 'ye' is 'YOSEMITE'.
(Other definitions for yosemite that I've seen before include "Where there are watery cascades" , "Area of beauty" , "US National Park in California" , "Californian national park" , "Natl. Park in California" .)