Idiom:a piece of the action or a slice of the action

1. a piece/slice of the action (informal): being involved in something successful that someone else started. 

• Now research has proved that the new drug is effective, everyone wants a piece of the action.
  

자료: Cambridge International Dictionary of Idioms © Cambridge University Press 1998

2. If someone wants to have a piece of the action or a slice of the action, they want to take part in an exciting activity or situation, usually in order to make moneyor become more important. 

자료: Collins Cobuild