Crossword Genius

Face-saving provision – for vision! (5)

Ross

I believe the answer is:

visor

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'face-saving provision' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'for vision' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

Can you help me to learn more?

(Other definitions for visor that I've seen before include "Anti-glare flap over the windscreen" , "Screen to filter glare" , "eye-shield" , "Helmet's face-cover" , "Sunshade" .)

I've seen this clue in the Evening Standard.
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