Dance band leader meets everybody (4)
I believe the answer is:
ball
'dance' is the definition.
(ball is a kind of dance)
'band leader meets everybody' is the wordplay.
'leader' says to take the initial letters.
'meets' says to put letters next to each other.
'everybody' becomes 'all' (all people).
The initial letter of 'band' is 'b'.
'b'+'all'='BALL'
(Other definitions for ball that I've seen before include "Old song: 'After the .... was over'" , "Social function for dancing" , "Round object - dance" , "Formal dance gathering" , "Sphere; function" .)