Apollo 13, for one

MISSION

Think of a word that describes a planned space voyage with a specific goal.

"Apollo 13, for one" hints at the answer "MISSION" because Apollo 13 was a famous NASA spaceflight, and "mission" is the general term for such a planned voyage or operation. The clue uses "for one" to suggest this is just a single example of many possible missions, not the specific name of the spacecraft itself. It’s a straightforward definition clue with no wordplay—just a direct reference to a well-known event.