She brings a degree of cold to a winter month (6)
I believe the answer is:
janice
'she' is the definition.
'cold to a winter month' is the wordplay.
'cold' becomes 'ice' (I've seen this before).
'to a' means one lot of letters go next to another (I've seen this in other clues).
'winter month' becomes 'jan' (short for January).
'ice' after 'jan' is 'JANICE'.
'brings a degree of' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Another definition for janice that I've seen is " girl".)