Related Clues:
- Guarded against discovery
- Like some formulas and identities
- Not to be shared, in a way
- Hush-hush religious education in cult
- Unfamiliar to most
- One might be whispered
- Word before 'sauce' or 'Santa'
- With 35-Across, anonymous voting method, and a hint to each set of circled letters
- Grasped by few
- Understood only by the few
- Like some agents and Santas
- When revealed in this puzzle, it reverses the meanings of the answers to the starred clues
- Kept from circulating
- Relatively unknown
- Keep quiet about religious splinter group conversion.