Band of very cold weather reported (6)
I believe the answer is:
frieze
'band' is the definition.
(decorative band in architecture)
'very cold weather reported' is the wordplay.
'very cold weather' becomes 'freeze' (freeze can mean a period of cold weather).
'reported' indicates a 'sounds like' (homophone) clue.
'freeze' sounds like 'FRIEZE'.
'of' is the link.
(Other definitions for frieze that I've seen before include "this band goes up the wall" , "Decorator's band" , "Architectural decoration" , "Painted or sculpted band running round under the ceiling" , "architectural feature" .)