Not suitable as food; uneatable (8)
I believe the answer is:
inedible
This clue is a double definition.
'not suitable as food' is the first definition.
(I've seen this before)
'uneatable' is the second definition.
(synonyms)
(Other definitions for inedible that I've seen before include "needing to be taken off table?" , "unfit for course!" , "Not suitable as food" , "Not fit to eat" , "Awful to taste" .)