Related Clues:
- Describing tiny particles
- Wee Thomas is in first class with Charlie on the radio
- Very small volume accompanying N-Z I see announced
- Seen scratching the head and drunk
- Extremely minute
- Like numbers in the periodic table
- __ energy
- Like some periodic-table data
- Thomas in first class has copyright for very small quantities
- Kind of bomb since the 1940s
- ___ clock
- Thomas in first class has constant pent-up energy
- Like houseplants
- Like house plants
- With 38-Down, property of the first part of the answer to each starred clue (appropriately positioned in the grid)