What can I expect as far as withdrawal symptoms when weaning off clonazepam if don't add another antidepressant on top of lexapro (escitalopram)?

Depends......... Your response to being weaned off will most likely depend on how well the original condition for which the Clonazepam was prescribed has been treated. If you are gradually tapered off, you may not experience any withdrawal symptoms. However some people after a long time on medications like Clonazepam become psychologically dependent on it and may have a hard time getting off if it.