Window in a roof or ceiling (8)

I believe the answer is:

skylight

I believe this is a double definition.

'window in a roof' is the first definition.
(I've seen this before)

'ceiling' is the second definition.
(thesaurus)

(Other definitions for skylight that I've seen before include "Attic window" , "Window in a roof or ceiling" .)

I've seen this clue in The Mirror.

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