Green site converted into nature reserve (9)
I believe the answer is:
serengeti
'nature reserve' is the definition.
'serengeti' can be an answer for 'reserve' (I've seen this before). I am unsure of the 'nature' bit.
'green site converted' is the wordplay.
'converted' is an anagram indicator.
'green'+'site'='greensite'
'greensite' is an anagram of 'SERENGETI'.
'into' acts as a link.
Can you help me to learn more?
(Other definitions for serengeti that I've seen before include "where lion holds sway?" , "African ecosystem" , "Tiger seen in Tanzania's great National Park" , "Huge plain in Tanzania" , "area of Tanzania" .)