The most common and most likely answer to this crossword clue is the 8 plus 6 letter word NORTHERN LIGHTS
I've seen this crossword clue in The Times
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 "a must-see for Arctic cruisers?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a must-see for arctic cruisers? = 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.