The most common and most likely answer to this crossword clue is the 5 plus 3 letter word CHESS SET
I've seen this crossword clue in The Daily Telegraph
C
H
E
S
S
S
E
T
More clues leading to the result CHESS SET
- All pieces for playing with at five o’clock must go in box
- All men on board, in black and white?
- Given three seconds, revolutionary lefty oddly missing kings, queens, etc
- Playing pieces German forces Earl to put in box
- All it needs is the board to engage in battle of wits
- Musical group that’s needed for board meeting?
- Requirement to get men on board…
- Complete gathering of men for a board meeting
- All the men on board
- Box to hold two shillings and electronic board with 32 pieces
Buddy explains!

The straight part
We know that "Musical group that’s needed for board meeting" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case musical group that’s needed for board meeting = chess set.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.