Related Clues:

• Such as Open Sesame
• It may have made Reeves's verse accessible
• Secretaries maybe foil security measure
• Shibboleth
• Term of admission that had previously been agreed
• Fool rejected brand name to gain entry
• Old man's weapon that's needed to get into base
• The old man's weapon is something guard may want
• Weapon the old man has for response to challenge
• Power when weapon gives means to enter camp?
• Don't answer the questions for first four characters in 6 down - it's an issue of security
• Release news of security issue
• Send message, one maybe stolen by 21
• Step over weapon that's required by sentry
• Security input