Star is dazzling, or luminous at first (4)

I believe the answer is:

idol

'star' is the definition.
(I know that idol is a type of star)

'is dazzling or luminous at first' is the wordplay.
'at first' indicates taking the first letters.
The first letters of 'is dazzling or luminous' is 'IDOL'.

(Other definitions for idol that I've seen before include "False god" , "A graven image, or a hero" , "Hero, star" , "Object of excessive love or devotion" , "Pagan symbol" .)

I've seen this clue in The Telegraph.

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