Cryptic crossword clue
Notice opening time before Christmas 6

The most common and most likely answer to this crossword clue is the 6 letter word ADVENT

A
D
V
E
N
T


Buddy explains!

The straight part
We know that "time before Christmas" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case time before christmas = advent.
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 ADVENT mean?

ADVENT noun
  1. Arrival; onset; a time when something first comes or appears

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