Freezing, very cold (3)
I believe the answer is:
icy
This clue is a double definition.
'freezing' is the first definition.
(synonyms)
'very cold' is the second definition.
(I've seen this before)
(Other definitions for icy that I've seen before include "Distant - freezing" , "Posing danger on the road" , "Glacial" , "frozen over!" , "Freezing cold" .)