Of the far north or south (5)
I believe the answer is:
polar
'of the far north or south' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for polar that I've seen before include "Regions at the top and bottom of the world" , "From one end of the Earth or the other" , "Of the cold regions" , "White bear" , "extremes of 3 or 26 [NORTH OR SOUTH]" .)