Related Clues:

• Denies access to
• 3 Musketeers units
• Cell components
• They're not fun to be behind
• Cell feature
• Keeps out
• Cell feature
• Musical units
• Excludes
• Butter units
• Cell wall, perhaps
• Milky Way and others
• Gin mills
• Where some screwdrivers are sold
• Components of some codes