Solutions One takes prisoners has 8 entries with similar clues
- powwowMeeting, something exciting for prisoners?
- dungeonDark underground cell for prisoners
- lockdownAct of confining prisoners to their cell
- flagshipInvincible perhaps, informed on fellow prisoners
- panopticonA circular prison with cells arranged around a central well from which prisoners could at all times be observed
- black-mariaPolice vehicle for transporting the prisoners
- firing-squadGroup detailed to shoot condemned prisoners
- billiard-roomWhere one takes one's cue