Two teas before tea dance (3-3-3)
I believe the answer is:
cha-cha-cha
'dance' is the definition.
(I've seen this before)
'two teas before tea' is the wordplay.
'two teas' can mean two substitutions for 'tea'.
'tea' becomes 'cha' (cha is a type of tea).
'tea' becomes 'cha' (cha is a type of tea).
'before' is a charade indicator (letters next to each other).
'tea' becomes 'cha' (cha is a type of tea).
'cha'+'cha'+'cha'='CHA-CHA-CHA'
(Other definitions for cha-cha-cha that I've seen before include "Latin-American dance" , "Latin American dance, sounds trebled" , "A Latin American dance, very repetitive" , "Latin American dance - 1-2-3 rhythm" , "Ballroom dance" .)