Nation, say (5)
I believe the answer is:
state
This clue is a double definition.
'nation' is the first definition.
(I know that nation can be written as state)
'say' is the second definition.
(synonyms)
(Other definitions for state that I've seen before include "Condition - sovereign political power" , "Declare - political unit" , "See 3" , "Claim" , "Part of America" .)