Winter weather in south at present (4)
I believe the answer is:
snow
'winter weather' is the definition.
(I've seen this before)
'south at present' is the wordplay.
'south' becomes 's' (abbreviation).
'at present' becomes 'now' (synonyms).
's'+'now'='SNOW'
'in' is the link.
(Other definitions for snow that I've seen before include "It falls in flakes" , "Ice crystal precipitation" , "Slangy cocaine or other white stuff" , "Downfall of white" , "Wintery precipitation" .)