The most common and most likely answer to this crossword clue is the 8 plus 6 letter word NORTHERN LIGHTS
N
O
R
T
H
E
R
N
L
I
G
H
T
S
More clues leading to the result NORTHERN LIGHTS
- Nth herring lost at sea, a must-see for Arctic cruisers?
- Celestial phenomenon stars follow and not sailors
- Air displaywith pet food
- Source of luminance interrupting darkness between Norway, the tip of Russia and Sweden?
- Merry dancers having drunk Nth short linger
- Breaking news! Writing in other words is a natural phenomenon!
- An impressive natural winter spectacle in the Arctics
- Crossword answers in top half of the grid? Not exactly
- Celestial phenomenon stars follow and not sailors?
Buddy explains!

The straight part
We know that "Source of luminance interrupting darkness between Norway, the tip of Russia and Sweden" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case source of luminance interrupting darkness between norway, the tip of russia and sweden = northern lights.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.