Solutions A circular prison with cells arranged around a central well from which prisoners could at all times be observed has 9 entries with similar clues
- captorOne takes prisoners
- powwowMeeting, something exciting for prisoners?
- dungeonDark underground cell for prisoners
- shudderShake from/with fear
- flagshipInvincible perhaps, informed on fellow prisoners
- deadlockSituation from/in which no progress can be made
- lockdownAct of confining prisoners to their cell
- black-mariaPolice vehicle for transporting the prisoners
- firing-squadGroup detailed to shoot condemned prisoners