A space built around hospital for some Indians in America (7)

I believe the answer is:
apaches
'indians in america' is the definition.
'apaches' can be an answer for 'indians' (Apache is an example). I am unsure of the 'in america' bit.
'a space built around hospital for some' is the wordplay.
'built' indicates an anagram.
'around' indicates putting letters inside.
'hospital' becomes 'h' (abbreviation for hospital on maps).
'for' means one lot of letters go next to another (I've seen this in other clues).
'some' becomes 'a' ().
'space' with letters rearranged gives 'paces'.
'paces' enclosing 'h' is 'paches'.
'paches' after 'a' is 'APACHES'.
Can you help me to learn more?
(Other definitions for apaches that I've seen before include "Native Americans" , "Indians" .)
