This Advisory Condition check the state of the CLR configuration option.
Check
Is the configuration disabled?
Enabled is correct in this circumstance, if disabled is desired as the default then change "Does not equal" to "Equals"
Next Steps
To enable CLR run the following T-SQL code:
EXEC sp_configure 'clr enabled', 1; RECONFIGURE;
To disable CLR run the following T-SQL code:
EXEC sp_configure 'clr enabled', 0; RECONFIGURE;
Run the following T-SQL code to check the status:
select value from sys.configurations where name = 'clr enabled';
Microsoft documentation on enabling CLR can be found here and here