Train conductor's cry … or a hint to each word in the answers to the starred clues

ALLABOARD

Think of what a conductor shouts when it's time to depart—or look for a phrase that fits before every word in the starred answers.

The clue plays on the classic phrase a train conductor shouts when a train is about to depart: "All aboard!" The second part hints that the answer also describes the answers to the starred clues—each of those words starts with "ALL" (like "all-star" or "all-nighter"). It’s a double meaning where the answer fits both as a literal cry and as a prefix shared by other solutions.