Cut south all the time (5)
I believe the answer is:
sever
'cut' is the definition.
(to sever is to cut or split)
'south all the time' is the wordplay.
'south' becomes 's' (abbreviation).
'all the time' becomes 'ever' (I've seen this in another clue).
's'+'ever'='SEVER'
(Other definitions for sever that I've seen before include "Cut completely" , "Detach" , "Cut into parts" , "Divide by cutting" , "Verse (anag)" .)