Develop green site as a place for animal sanctuary (9)
I believe the answer is:
serengeti
'a place for animal sanctuary' is the definition.
(national park in Tanzania)
'develop green site' is the wordplay.
'develop' indicates an anagram.
'green'+'site'='greensite'
'greensite' anagrammed gives 'SERENGETI'.
'as' is the link.
(Other definitions for serengeti that I've seen before include "where lion holds sway?" , "Green ties (anag.)" , "reserve for game" , "place to watch game" , "Wildlife preserve (and National Park) in Tanzania" .)