Nightlight (4)

I believe the answer is:

star

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

'light' is the definition.
(I have seen 'Heavenly light ' mean 'star' so perhaps 'light' could also mean 'star')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for star that I've seen before include "eg The sun" , "Celebrity - shining light" , "Big name" , "Asterisk" , "Luminary" .)

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