Feline inhabiting China's green peninsula (7)
I believe the answer is:
yucatan
'peninsula' is the definition.
(Yucatan Peninsula is an example)
'feline inhabiting china's green' is the wordplay.
'feline' becomes 'cat' (cat is a kind of feline).
'inhabiting' is an insertion indicator (I've seen this in other clues).
'china's green' becomes 'yuan' (I am not sure about this - if you are sure you should believe this answer much more).
'cat' going inside 'yuan' is 'YUCATAN'.
Can you help me to learn more?
(Other definitions for yucatan that I've seen before include "Mayan area of Mexico" , "part of Mexico" , "Mexican peninsula where Mayas lived" , "N. Mexican peninsula" , "Region of Mexico" .)