Light reading on this (6)

I believe the answer is:

kindle

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'light' is the definition.
(I know that kindle is a type of light)

I don't understand the rest of the clue.

(Other definitions for kindle that I've seen before include "Modern book store" , "Ignite" , "Light (fire)" , "Set of fire" , "Cause to begin burning" .)

I've seen this clue in The Telegraph.

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