An early riser (3)

I believe the answer is:

sun

'an early riser' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for sun that I've seen before include "Star; paper" , "It's sol in Latin" , "Get a tan" , "Source of daylight" , "Star that provides light and heat for a solar system" .)

I've seen this clue in the Evening Standard.

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