The most common and most likely answer to this crossword clue is the 6 letter word FJORDS
I've seen this crossword clue in The Guardian
F
J
O
R
D
S
More clues leading to the result FJORDS
Buddy explains!

The straight part
We know that "common in Norway" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case common in norway = fjords.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 FJORDS mean?
FJORDS noun- A long, narrow, deep inlet between cliffs.