Now in white (5)
I believe the answer is:
snowy
'now in white' is the definition.
'snowy' can be an answer for 'white' (similar in meaning). I am not sure about the 'now in' bit.
'now in white' is the wordplay.
'in' is an insertion indicator.
'white' becomes 'sy' (I can't explain this - if you can you should believe this answer much more).
'now' placed within '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" .)