Unfit for consumption (8)
I believe the answer is:
inedible
'unfit for consumption' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for inedible that I've seen before include "Unpalatable" , "not to be swallowed" , "Not fit to eat" , "Not suitable for consumption" , "Not fit for consumption" .)