Symbol of winter: bird with barer notes when shivering (5,9)
I believe the answer is:
robin redbreast
'symbol of winter' is the definition.
'bird with barer notes when shivering' is the wordplay.
'with' says to put letters next to each other.
'when shivering' indicates anagramming the letters.
'barer'+'notes'='barernotes'
'bird' put after 'barernotes' is 'barernotesbird'.
'barernotesbird' with letters rearranged gives 'ROBIN REDBREAST'.
(Other definitions for robin redbreast that I've seen before include "Songbird" , "bird" .)