You can delete a custom cluster definition. Default cluster definitions cannot be
  deleted.
    Required role: Owner of the cluster
      definition
  - 
    Log in to the Cloudera web interface.
   
 - 
        Navigate to the environment in which you created the definition, then click the
            Cluster Definitions tab.
      
 - 
    Select one or more custom cluster definitions.
   
 - 
    Click 
.
    - 
    Click Yes to confirm delete.
    
     After performing these steps, the selected cluster definition(s) will be deleted.