influential person; person of influence
Refers to someone who wields considerable influence or power in a particular sphere, often with a nuance of throwing their weight around. The word is somewhat colloquial and can carry a slightly negative connotation of overbearing influence.
He is an influential figure in local politics.
That senior colleague is known as a person of influence in the company.
Formed from 幅が利く, “to have influence,” with the verb nominalized as 利き. It denotes a person whose standing or influence carries weight.