Not sweet (7)
I believe the answer is:
savoury
'not sweet' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for savoury that I've seen before include "Salty or spicy - not sweet" , "Appetising; not sweet" , "'Tasty, not sweet (7)'" , "Morally wholesome" , "Delicious" .)