Toward the Arctic Circle (5)
I believe the answer is:
north
'toward the arctic circle' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for north that I've seen before include "Compass point at 0 or 360 degrees" , "Pole" , "A 24 [STAR]" , "Thorn (anag.)" , "coming up from Brighton?" .)