How is “clear as day” used?

In Doctor Who: The Day of the Doctor (2013), one line is: “This face has seen conflict. It's clear as day.”

Which movie is “clear as day” from?

The clip at the top of this page is from Doctor Who: The Day of the Doctor (2013).

This face has seen conflict. It's clear as day.

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This face has seen conflict. It's clear as day.
...our names as clear as day.

定義：Oxford Advanced Learner's Dictionary 第 9 版