Possible Clues:

• Lack of transparency
• Murkiness
• Obscure quality of work on a centre of population
• Work over a town like this? That's a bit thick!
• It's a bit thick to have to get work with a town
• Work on a place that is incomprehensible
• Not allowing passage through a large town after work
• Non-transparency
• Obscureness of article in work referred to by unknown
• Condition of lacking transparency