There's nothing in the directions about wintry weather (4)
I believe the answer is:
snow
'weather' is the definition.
(snow is a kind of weather)
'there's nothing in the directions about wintry' is the wordplay.
'there's' says to put letters next to each other.
'nothing in' becomes 'o' (I've seen this in other clues).
'the directions' becomes 'ns' (N is an example).
'about' says the letters should be written in reverse.
'wintry' becomes 'w' (this might be a standard abbreviation of which I'm unaware).
'o'+'ns'='ons'
'ons' backwards is 'sno'.
'sno' put next to 'w' is 'SNOW'.
Can you help me to learn more?
(Other definitions for snow that I've seen before include "Wintry stuff" , "Winter weather" , "Flakes overhead" , "Wintry weather" , "White flakes" .)