Crossword Genius

Possibly partial provision for light protection (5)

Ross

I believe the answer is:

visor

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'protection' is the definition.
(visor is a kind of protection)

I can't explain the remainder of the clue.

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(Other definitions for visor that I've seen before include "Movable front part of helmet" , "Transparent flap on a helmet" , "Mask" , "Sunshade" , "Helmet's face-cover" .)

I've seen this clue in the Evening Standard.
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