Not in a fantastic state (6)
I believe the answer is:
nation
'state' is the definition.
(I know that state can be written as nation)
'not in a fantastic' is the wordplay.
'fantastic' is an anagram indicator.
'not'+'in'+'a'='notina'
'notina' with letters rearranged gives 'NATION'.
(Other definitions for nation that I've seen before include "Body of people under one government" , "Turkey?" , "Large community in one place under one government" , "A federation of tribes, as Native Americans say" , "People sharing a common culture/descent" .)