Curry gets cold, very cold (6)
I believe the answer is:
baltic
'very cold' is the definition.
(baltic can informally mean very cold)
'curry gets cold' is the wordplay.
'curry' becomes 'balti'.
'gets' is a charade indicator (letters next to each other).
'cold' becomes 'C' (abbreviation, eg on taps).
'balti'+'c'='BALTIC'
(Other definitions for baltic that I've seen before include "Almost land-locked sea of NE Europe" , "The Sea around Scandinavia" , "Near-landlocked sea of N Europe" , "N European sea" , "Scandinavian sea" .)