Ground, i.e. Regent's Park, given national status (9)
I believe the answer is:
serengeti
'park given national status' is the definition.
(national park in Tanzania)
'ground i e regent's' is the wordplay.
'ground' indicates an anagram ('grind' the letters into a new form).
'i'+'e'+'regents'='ieregents'
'ieregents' is an anagram of 'SERENGETI'.
(Other definitions for serengeti that I've seen before include "Huge plain in Tanzania" , "Vast plain" , "reserve for game" , "place to watch game" , "where lion holds sway?" .)