Related Clues:

• Not standard
• 'The ___ Limits'
• Computer peripheral, e.g.
• Just adequate
• Exposed, as a wall
• __ Mongolia
• Adjective for some winter garments
• Edgy?
• "Ear" or "space" descriptor
• Supplemental component
• Home builder's afterthought
• Word with "space" or "limits"
• Expansion
• "Plan 9 From ___ Space"
• With 24-Down, category of garments fittingly found in the circled letters