have a hand in

have a hand in  {v. phr.}

Принимать участие (в чем-л.) или иметь влияние (на что-л.); отчасти отвечать за что-л.

Sue's schoolmates respect her and she has a hand in every important decision made by the Student Council.

Ben had a hand in getting ready the Senior play.

Ср.: FINGER IN THE PIE.