second-largest country (6)
I believe the answer is:
canada
'second-largest country' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for canada that I've seen before include "Country to north of USA" , "- Balsam; - goose" , "N.American nation" , "Part of North America" , "N American nation" .)