The most common and most likely answer to this crossword clue is the 10 letter word ATTENDANCE
I've seen this crossword clue in The Daily Telegraph
A
T
T
E
N
D
A
N
C
E
More clues leading to the result ATTENDANCE
- People turning up two hours before midnight to boogie
- People there groomed and neat, etc
- Presence at function about two hours before midnight?
- Being there two hours before noon, get down?
- People there wreck a tent at ball
- A lot of races finish next to a new church gate
- Appearance exactly two hours before Cinderella left ball
- Number present hours before midnight take steps
- Presence of an entry in Cinderella’s timetable?
- Be there in this
Buddy explains!

The straight part
We know that "Be there in this" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case be there in this = attendance.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 ATTENDANCE mean?
ATTENDANCE noun- The state of attending; presence or waiting upon.
- The count or list of individuals present for an event.
- The frequency with which one has been present for a regular activity or set of events.
- Attention paid to something; careful regard.