Data derived from rainforests (4)
I believe the answer is:
info
'data' is the definition.
(information)
'derived from rainforests' is the wordplay.
'derived from' says the answer is hidden in the clue.
'INFO' is hidden in the letters of 'rainforests'.
(Other definitions for info that I've seen before include "Latest" , "Intelligence (abbr)" , "Facts; knowledge gained" , "Dope" , "News" .)