fixer n.3
(US police) a fixed footpost, e.g. outside a possible target for attack, where an officer can be stationed.
 | ‘Police (Cops?) have Slanguage of Own’ in N.Y. Times 15 Feb. 65/3: Fixer—A fixed post in front of a consulate, school or other institution where a constant guard is maintained. | |
| Patrolman 87: A ‘fixer’ is a specific location within the precinct that the commanding officer deems worthy of special attention, for example, a Jewish synagogue or yeshiva. When you are assigned there, you are required to remain in front of the premises for the entire eight hours. |