Crossword Genius

Roof opening to allow passage of beams (8)

Ross

I believe the answer is:

skylight

'roof opening' is the definition.
(I've seen this in another clue)

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

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

I've seen this clue in The Times.
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