When knights were bold, it helped to save face (5)

I believe the answer is:

visor

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'face' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I can't see?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for visor that I've seen before include "One protecting" , "eye-shield" , "Moveable piece of helmet" , "Front piece of a helmet" , "Means of saving face" .)

I've seen this clue in the Evening Standard.

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