Musical group that's needed for board meeting? (5,3)
I believe the answer is:
chess set
'that's needed for board meeting?' is the definition.
(a chess match could jokingly be a 'board meeting')
'musical group' is the wordplay.
'musical' becomes 'chess' (Benny Andersson and Bjrn Ulvaeus musical).
'group' becomes 'set' (set is a kind of group).
'chess'+'set'='CHESS SET'
(Other definitions for chess set that I've seen before include "It's played with kings, queens and bishops" , "men, along with the board" , "Game with kings, queens and bishops" , "King, pawns etc." , "It's played on a chequered board with 32 pieces" .)