Very cold curry on top of chips! (6)
I believe the answer is:
baltic
'very cold' is the definition.
(baltic can informally mean very cold)
'curry on top of chips' is the wordplay.
'curry' becomes 'balti'.
'on top of' says to take the initial letters.
The initial letter of 'chips' is 'c'.
'balti'+'c'='BALTIC'
(Other definitions for baltic that I've seen before include "The Sea around Scandinavia" , "North European sea" , "Near-landlocked sea of N Europe" , "Sea in N.Europe" , "Northern European sea" .)