Crossword puzzle clue "one who takes action"

It doesn't convey ferocious fuel-burning action, action, action! when it's regular-sized

One who takes action

Takes in or takes on

Takes in or takes out

Takes hold of then takes direction from kings and queens, say (5)

Takes legal action

Takes the action

TV jargon term for Seinfeld's "The Chinese Restaurant" and others, in which all of the action takes place on a single set with only a few characters