A sign November is turning to December time (4)
I believe the answer is:
noel
'december time' is the definition.
'noel' can be an answer for 'time' (I have seen 'present time' mean 'noel' so perhaps 'time' could also mean 'noel'). I am not certain of the 'december' bit.
'a sign november is turning' is the wordplay.
'a sign' becomes 'Leo' (star sign).
'november' becomes 'N' (phonetic alphabet: alpha, bravo, charlie etc.).
'is turning' is a reversal indicator.
'leo'+'n'='leon'
'leon' in reverse letter order is 'NOEL'.
'to' is the link.
Can you help me to learn more?
(Other definitions for noel that I've seen before include "Religious festival" , "Coward who wrote and acted, d. 1973" , "A lone Christmas in France" , "Coward for one" , "Christmas carol" .)