How do I get the hierarchy in Clari to update?

The Salesforce Role Hierarchy syncs to Clari every 30 minutes or every 12 hours depending on your organization's setup. If you make updates to the Salesforce Role Hierarchy, then you will not see that update reflected in Clari until the data between Clari and Salesforce is refreshed.
 

However, if you make a change in Hierarchy Management in Clari (i.e. hiding a node, or renaming a node), then that change will be reflected in Clari immediately.
 

If you make a change to the Salesforce Role Hierarchy that you need to be reflected in Clari immediately, submit a support ticket.