It's not required to run the database, so you can disable it. I suspect it is related to the cloud control. The path to executable is as follows:
C:\app\smithp\product\11.2.0\dbhome_1\bin\OraClrAgnt.exe agent_sid=CLRExtProc max_dispatchers=2 tcp_dispatchers=0 max_task_threads=6 max_sessions=25 ENVS="EXTPROC_DLLS=ONLY:C:\app\smithp\product\11.2.0\dbhome_1\bin\oraclr11.dll"
I suspect it is related to the cloud control.
Then 11g is forward looking, as Cloud is a 12c concept.
Try googling 'ClrAgent' and you'll find out what it really is.
Or simply do a search on the 11.2 documentation set at docs.oracle.com
As part of Oracle Database Extensions for .NET installation, a Windows service is installed. The service is called
OraClrAgntand can be accessed through the Service Control Panel, as
ORACLE_HOMErepresents your Oracle home.
This service is used for the startup, configuration, and shutdown of the
I leave the details as a learning exercise for the student.