Green site redeveloped in national park (9)
I believe the answer is:
serengeti
'national park' is the definition.
(I've seen this before)
'green site redeveloped' is the wordplay.
'redeveloped' indicates anagramming the letters.
'green'+'site'='greensite'
'greensite' is an anagram of 'SERENGETI'.
'in' is the link.
(Other definitions for serengeti that I've seen before include "Wildlife-rich region of Africa" , "Huge plain in Tanzania" , "Tanzanian wildlife area" , "African ecosystem" , "reserve for game" .)