Derived from living matter (7)
I believe the answer is:
organic
'derived from living matter' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for organic that I've seen before include "Derived from animal or vegetable matter" , "without the use of chemicals" , "Biological" , "(Of food) produced without synthetic fertilisers or pesticides" , "No cigar (anag.)" .)