NAFTA signatory (6)
I believe the answer is:
canada
'nafta signatory' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for canada that I've seen before include "Second-largest country in the world by area" , "N American country" , "Ottawa is its capital" , "- Balsam; - goose" , "Land of the Great Lakes" .)