Crossword Genius

Usually, the rest of the night (5)

Ross

I believe the answer is:

sleep

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

'rest of the night' is the definition.
'sleep' can be an answer for 'rest' (synonyms). I am not certain of the 'of the night' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for sleep that I've seen before include "Doze, nap" , "Be dormant" , "crash" , "Produced (egg)" , "Wayne _; former Royal Ballet principal dancer" .)

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