Green that's not cooked (3)
I believe the answer is:
raw
I believe this is a double definition.
'green' is the first definition.
(both can mean naive or inexperienced)
'not cooked' is the second definition.
('raw' is the opposite to 'cooked')
'that's' is the link.
(Other definitions for raw that I've seen before include "Not prepared" , "Naked" , "Red and inflamed" , "not manufactured" , "Not cooked" .)