Crossword Genius

Planetary lighting centre (3)

Ross

I believe the answer is:

sun

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'planetary lighting centre' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

This is all the clue.

Can you help me to learn more?

(Other definitions for sun that I've seen before include "Rag" , "Helios, in Greek myth" , "Get a tan" , "It's sol in Latin" , "Nearest star to Earth" .)

I've seen this clue in the Evening Standard.
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