Unpalatable (8)
I believe the answer is:
inedible
'unpalatable' is the definition.
(unpalatable can mean not very nice to eat)
This is the entire clue.
(Other definitions for inedible that I've seen before include "Unpalatable" , "Not suitable as food" , "Unfit for consumption" , "Uneatable" , "not to be swallowed" .)