The most common and most likely answer to this crossword clue is the 5 letter word SNOWY
I've seen this crossword clue in Independent
S
N
O
W
Y
More clues leading to the result SNOWY
Buddy explains!
The straight part
We know that "Christmassy" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case christmassy = snowy.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 SNOWY mean?
SNOWY adjective- Marked by snow, characterized by snow.
- Covered with snow, snow-covered, besnowed.
- Snow-white in color, white as snow.
- A large, white, nomadic Arctic owl, Bubo scandiacus.