Support for running "clear" commands 

Hi
For a project we are working on we need to execute a "clear" command to clear the qos counters on device interfaces. 
This command is not supported by the xml agent.
Is there a way to exit the xml mode temporarily to run that command and return to it after?
This is mainly to avoid having to open a new ssh connection just to achieve that one clear qos counter operation.
Many thanks.