Can anyone tell me how i can release a single object instance of a user-defined class from memory?

i do not want to wait for the object instance to go out of scope or wait for the program to end or to do a CLEAR ALL to achieve this.

Example: i have an object-reference 'oTest'
oTest = CREATEOBJECT('clsTest')

Any help will be appreciated!
Many thanks :)

Mazlan Bin Mohammad