Lighting the top of the stairs (7)

I believe the answer is:

landing

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'top of the stairs' is the definition.
(area at the top of a flight of stairs)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for landing that I've seen before include "Touching down" , "Going to ground" , "Alighting point" , "Reaching the shore" , "Intermediate platform in a staircase" .)

I've seen this clue in The Globe and Mail.

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