Not fit for consumption (8)
I believe the answer is:
inedible
'not fit for consumption' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for inedible that I've seen before include "Not good as food" , "Unpalatable" , "Not fit for consumption" , "Unfit for consumption" , "needing to be taken off table?" .)