The most common and most likely answer to this crossword clue is the 7 letter word CAROUSE
I've seen this crossword clue in The Guardian
C
A
R
O
U
S
E
More clues leading to the result CAROUSE
- Noisy revelling — endless feature of funfair
- Make merry in saloon, possibly by river
- Many move to have a drinking spree
- Party may make Charlie get excited
- Make merry love on river, within reason
- Party with two runners?
- Party making Conservative get excited
- Go bingeing? Leave vehicle by front of ‘ome maybe!
- Vehicle with zero purpose except to have great fun
- Knees-up about to start
Buddy explains!

The straight part
We know that "Party" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case party = carouse.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 CAROUSE mean?
CAROUSE noun- A large draught of liquor.
- A drinking match; a carousal.
- To engage in a noisy or drunken social gathering.
- To drink to excess.