Related Clues:

• Horse has gone off to get cooler
• Unpleasant cell
• Place of confinement debt collector has no say about
• French port, according to locals seen in wellies rampaging about
• Muck over time found in subterraneous accommodation
• Was tunnelling long time to get outside new prison
• Grey, say, up above, cooler underground
• Waste long time in prison
• Debt-collector gone mad in underground cell
• Prison cell — muck one out
• Subterranean prison
• Dark room -- shade gone, unfortunately
• Basement of a castle, perhaps
• Dark underground cell
• Port city of France