The most common and most likely answer to this crossword clue is the 9 letter word APRES-SKI
I've seen this crossword clue in Independent
A
P
R
E
S
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S
K
I
More clues leading to the result APRES-SKI
- Urge King to participate in excellent social event after sport
- In lodge, relaxing mostly, like to drink squash
- Social activity after going downhill fast?
- Evening of fun with squeeze, getting into a kiss? Not half
- Ask Piers to dance, socialising in Davos?
- Party when a squeeze gets a bit of a smooch!
- Papers in evenly backlit Alpine fun?
- Father returns with skiers out for social activity
- A crowd joins most of family for night-time fun in Klosters?
- . Social event for media following a cocktail mid-air
Buddy explains!

The straight part
We know that "night-time fun in Klosters?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case night-time fun in klosters? = apres-ski.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.