Related Clues:

• One of 64 divisions of Louisiana
• Trade ___ (Coca-Cola's recipe, e.g.)
• Held for a more opportune time
• Stashed in a safe place
• Prepared for a surprise party, say
• It's meant to be kept
• Covert; classified
• Like Superman's alter ego
• Guarded against discovery
• Like some formulas and identities
• Not to be shared, in a way
• Hush-hush religious education in cult
• One might be whispered
• Word before 'sauce' or 'Santa'