Crossword Genius

Such a preview will give information (5)

Ross

I believe the answer is:

sneak

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'such a preview' is the definition.
(sneak preview is a kind of preview)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for sneak that I've seen before include "Snitcher" , "To go stealthily" , "Go furtively - inform on another child" , "peach" , "thief" .)

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