Co-operate in drama and dance (4,4)
I believe the answer is:
play ball
'co-operate' is the definition.
(I've seen this before)
'drama and dance' is the wordplay.
'drama' becomes 'play' (synonyms).
'and' means one lot of letters go next to another.
'dance' becomes 'ball' (ball is a kind of dance).
'play'+'ball'='PLAY BALL'
'in' is the link.
(Other definitions for play ball that I've seen before include "Do what is needed" , "Co-operate" , "Most boys love to" , "Be cooperative" , "meet a delivery?" .)