Be clear on or about
What do they mean exactly?
My Attempt
Be clear on sth = not to have an exact idea about something

Be clear about = not to say something clearly to somebody else.

Does it make sense?

Thanks

Question

Be clear on or about
What do they mean exactly?
My Attempt
Be clear on sth =  not to have an exact idea about something

Be clear about = not to say something clearly to somebody else.

Does it make sense?

Thanks

Answer

Great question. I have seen both 'clear about' and 'clear on'.  My opinion is that 'clear about' is better and can be used for both situations.
clear = certain
about = regarding
I want to understand something clearly / I want to be clear about something.
I want to explain something clearly / I want to be clear about something as I explain it.

Answer

My understanding is exactly the opposite of what you wrote in the question.

Be clear on something. = I understand that concept perfectly and exactly.
Be clear about... = I would usually use this when I am giving an instruction.  Example:  I want to be perfectly clear when I tell you that you should do the following...

Answer

They mean the same thing. To be clear on something or to be about something means to have a good understanding of it.