Now in white (5)
I believe the answer is:
snowy
'now in white' is the definition.
'snowy' can be an answer for 'white' (I've seen this before). I am not certain of the 'now in' bit.
'now in white' is the wordplay.
'in' means one lot of letters goes inside another.
'white' becomes 'sy' (I can't explain this - if you can you should give a lot more credence to this answer).
'now' put into 'sy' is 'SNOWY'.
Can you help me to learn more?
(Other definitions for snowy that I've seen before include "Like cold weather" , "- Mountains; - owl" , "Covered in flakes" , "Tintin's (white?) dog" , "Wintry" .)