A clear reason why you should include me in your plans.

It is hard to find a clear reason why some changed and others did not.

"Isn't it possible to do things without having any very clear reason?"

He often waves his arms around in the air for no clear reason.

But the doctor didn't recommend the test and wouldn't give me a clear reason.

To my mind there are clear political reasons for this.

I hope we can make clear to the public the reasons for our decision today.

You have blood in your stool for no clear reason.

"And you had a clear reason to watch your father closely?"

Your pain has lasted more than 3 months without a clear reason.