Alcan Highway site (6)
I believe the answer is:
'alcan highway site' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for alaska that I've seen before include "Anchorage location" , "Northmost US state" , "Forty-ninth US state" , "Sarah Palin's home state" , "that may be baked? Not by the sun" .)