Related Clues:

• Trick or treat, e.g.
• Evening star, e.g.
• It might be irregular
• Predicate need
• Earth, for one
• With 81-Across, landmark 1972 album by 3- and 126-Down
• Student group
• "___, won't you?" (query from old commercials for The Jetsons)
• Sentence necessity, often
• First or economy
• Pluto, until recently
• Word with ''upper'' or ''lower''
• Lonely ___
• World
• Publish or perish, e.g.