The most common and most likely answer to this crossword clue is the 6 letter word BOREAL
I've seen this crossword clue in Financial Times
B
O
R
E
A
L
More clues leading to the result BOREAL
Buddy explains!

The straight part
We know that "of the north" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case of the north = boreal.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does BOREAL mean?
BOREAL adjective- Of, relating to, or coming from the north.