Crossword Genius

For knights of old, a means of saving face (5)

Ross

I believe the answer is:

visor

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'means of saving face' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for visor that I've seen before include "piece of armour" , "Part of suit of armour" , "Means of saving face" , "eye-shield" , "Movable shield on helmet" .)

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