(as) clear as day
1. Very easy to see. The sign is right there on the door—it's as clear as day.
2. Very clear and easy to understand. I made sure the were instructions as clear as day so that there would be no confusion.
clear as day
If something is as clear as day, it is very easy to see, or very obvious and easy to understand. Suddenly she stepped out from behind a tree less than ten yards from me. I saw her face as clear as day. It's as clear as day he's not guilty.
as clear as day
very easy to see or understand.(as) clear as ˈday
easy to see or understand; obvious: Although it’s written on the door as clear as day, people still don’t realize that this room is private.