Better to spend an evening here? (6)

I believe the answer is:

casino

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'better to spend an evening here?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

This is all the clue.

Can you help me to learn more?

(Other definitions for casino that I've seen before include "Gambling-club" , "Gaming establishment" , "Where some gamblers go" , "You can win a fortune here" , "Gambling house" .)

I've seen this clue in The Sun.

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