The most common and most likely answer to this crossword clue is the 9 letter word ROISTERED
R
O
I
S
T
E
R
E
D
Buddy explains!
The straight part
We know that "Celebrated" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case celebrated = roistered.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 ROISTERED mean?
ROISTERED verb- To engage in noisy, drunken, or riotous behavior.
- To walk with a swaying motion.