Crossword Genius

Trick is to wake up with nothing missing (4)

Ross

I believe the answer is:

ruse

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'trick' is the definition.
(I've seen this in another clue)

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

Can you help me to learn more?

(Other definitions for ruse that I've seen before include "Ploy, artifice" , "Artful ploy" , "trick played" , "Sure its a strange deception" , "Sure to be a trick" .)

I've seen this clue in the Sydney Morning Herald.
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