Sheet that doesn't stay put - it's cold (3,4)
I believe the answer is:
ice floe
This could be a double definition.
'sheet that doesn't stay' is the first definition.
'ice floe' can be an answer for 'sheet' (I've seen this before). I am not sure about the remainder of the definition.
'it's cold' is the second definition.
(I know that ice floe is cold)
'put' is the link.
Can you help me to learn more?
(Other definitions for ice floe that I've seen before include "Expanse of frozen water" , "Frozen floating object" , "Large sheet of frozen water" , "Hazard to shipping" , "Large frozen sheet floating at sea" .)