From Grimm wiki
Clockmaker
In the *Grimm* franchise, "the Clockmaker" primarily refers to Monroe, a Blutbad and a key ally to Nick Burkhardt, who operates a clock and watch repair business from his home.
Monroe, whose full name is Monroe, is a skilled horologist, known for his expertise in repairing and restoring antique and modern clocks and watches. His workshop, located within his home, serves as his primary place of business. This profession provides a steady, quiet life for Monroe, which contrasts with his Wesen nature and his involvement in the dangerous world of Grimms and supernatural creatures.
The clockmaker's workshop is more than just a place of employment; it often functions as a safe haven and a meeting point for Nick and his allies, affectionately known as the Scooby Gang. It is a space where they can discuss cases, research Wesen lore, and plan their next moves away from the public eye. Monroe's meticulous nature and attention to detail, evident in his clockmaking, are also reflected in his approach to assisting Nick with investigations and understanding the complexities of the Wesen world.
While Monroe's clockmaking business is a consistent background element, it occasionally plays a direct role in the narrative, such as when specific timepieces or mechanical devices become relevant to a Wesen case. His unique skills and knowledge of intricate mechanisms sometimes provide crucial insights or practical assistance in solving supernatural mysteries.