Crossword Genius

At the end of the day, is this a galaxy? (6)

Ross

I believe the answer is:

sunset

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

This clue could be a double definition.

'at the end of the day' is the first definition.
(I've seen this before)

'this a galaxy?' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'is' is the link.

Can you help me to learn more?

(Other definitions for sunset that I've seen before include "Onset of night" , "daily event" , "When the light begins to fall below the horizon" , "End of the day - maybe a bright one" , "Twilight time" .)

I've seen this clue in The Independent.
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