Wintry weather in South at present time (4)
I believe the answer is:
snow
'wintry weather' is the definition.
(I've seen this before)
'south at present time' is the wordplay.
'south' becomes 's' ('S' can be a synonym of 'south').
'at' means one lot of letters go next to another.
'present time' becomes 'now' (I've seen this before**).
's'+'now'='SNOW'
'in' acts as a link.
(Other definitions for snow that I've seen before include "Basic White Christmas ingredient" , "Precipitation falling as flakes" , "White specks on screen resulting from interference" , "Weather feature" , "novelist" .)