Possible Clues:

• Monk shivering is certain to catch cold
• Member of a monastic order, noted for austerity and a vow of silence
• Brother I see sent up after relative losing head in prison
• Monk having nun (so to speak) — one imprisoned?
• One obeying order to surround agents with tank
• Man following order put spies inside tank
• Order for stone coffin someone from the West Midlands once executed
• Member of an order of monks that is an offshoot of the Benedictines
• Monk
• Monk retiring so certain to be refreshed