Related Clues:

• Place on the border needing a sign of security
• Promise of parking on port side
• Stapled gerund to obscure word
• One should abstain from putting one's name to it
• Promise (to abstain?)
• Brass tacks
• Extraction of principled gentlemen's agreement
• Primer fodder
• Early learning
• While it's a bit of an A to Z, it's more to do with a subject's first principles
• Telethon donation
• Letters for Dick and Jane
• Basic lessons
• Pre-K basics
• Preschool subject