Crossword puzzle clue "joint action"

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

By the joint action of

Joint action undertaken secretly

Its nuclear program is the subject of the Joint Comprehensive Plan of Action

Joint action

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."

Case the joint, say