Final answer:
Clear communication is actually a solution to preventing wasted time, whereas inefficient meetings, excessive multitasking, and micromanagement are causes of wasted time for managers.
Step-by-step explanation:
The leading causes of wasted time for managers include all of the following except clear communication. In fact, clear communication is usually a solution to preventing wasted time rather than a cause. On the other hand, inefficient meetings, excessive multitasking, and micromanagement are known to contribute to a lack of productivity and are considered time-wasters in the context of management.