Crossword puzzle clue "start an action"

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

Piece of the action, or a shout that stops the action

Who said "Action may not always bring happiness, but there is no happiness without action."

Take ___ (start an action)

Start an action

Start a class action, perhaps

Helps (a start-up) start up

Start's start?