No salt? Disgusting! (9)
I believe the answer is:
Here is my best explanation:
This clue might be a double definition.
'no salt?' is the first definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?
'disgusting' is the second definition.
(Other definitions for unsavoury that I've seen before include "Nasty - tasteless", "offensive", "revolting?", "Distasteful" and "Disreputable".)