Crossword Genius

Star as a roof-raiser? (8)

Ross

I believe the answer is:

skylight

I'm a little stuck... Click here to teach me more about this clue!

'star' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

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

Can you help me to learn more?

(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 Globe and Mail.
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