Crossword Genius

Apt letters missing from _ _ ipper _ (3)

Ross

I believe the answer is:

sly

(Other definitions for sly that I've seen before include "Unpleasantly cunning and secretive" , "Cunning, foxy" , "Artful" , "Wily, shifty" , "Doing things in unpleasant and secret way" .)

I've seen this clue in The New York Times.
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