Possible Clues:

• What a dirty long time in prison!
• Require payment for information about old prison
• Debt collector has gone astray, resulting in prison
• Castle section
• 'A - - horrible, on all sides round As one great furnace flam'd;' Milton's Paradise Lost
• There's a long, smelly time for the prisoner there
• Underground prison-cell
• Oubliette
• Finally arrested with gun, flung a long time in cell
• Prisoner's cell gets muck over a long period of time