Large country (6)
'large country' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for russia that I've seen before include "Sing US airs badly in the country" , "What was the RSFSR" , "East European country" , "Country where Omsk is situated" , "James Bond novel and film: 'From . . . . . . with Love'" .)
(Other definitions for canada that I've seen before include "N.American nation" , "N American nation" , "North American goose" , "Country of 32 ac" , "North American country" .)