Related Clues:

• Pen pal?
• Arsonist, e.g.
• Cell resident
• Burglar, e.g.
• Law-breaker
• Menace to society
• Sentence finisher?
• One with convictions
• Thief, e.g.
• Pen denizen
• Yardbird
• Cop's quarry
• Confined con
• Cell body
• Con, perhaps