Related Clues:

• ___ number
• Prison compartment
• Room in a big house?
• Texting device
• Block division
• Dry __
• Word on a business card
• Room in the big house
• Eponymous engineer
• The 'W' of kWh
• Pen pal's place?
• Portable phone
• Joule per second
• Lockup room
• Lightbulb measure