Country, we hear, that's cold (6)
I believe the answer is:
chilly
'cold' is the definition.
(I've seen this before)
'country we hear' is the wordplay.
'country' becomes 'Chile' (Chile is a country).
'we hear' indicates a 'sounds like' (homophone) clue.
'chile' sounds like 'CHILLY'.
'that's' acts as a link.
(Other definitions for chilly that I've seen before include "(Of weather) bracing" , "Unfriendly; coldish" , "unwelcoming" , "Parky" , "Descriptive of cold weather" .)