finger in the pie
finger in the pie also finger in every pie {n. phr.}, {informal}
Something to do with what happens; part interest or responsibility.
When the girls got up a Christmas party, I felt sure Alice had a finger in the pie.
The Jones Company was chosen to build the new hospital and we knew Mr. Smith had a finger in the pie.
Jack is a boy with a finger in every pie at school, from dramatics to football.
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Source: A Dictionary of American Idioms