Crossword Genius

On the __: furtively (3)

Ross

I believe the answer is:

sly

(Other definitions for sly that I've seen before include "Cunning, deceitful" , "Cunning, foxy" , "Cunning; surreptitious" , "Devious and furtive" , "Sneaky" .)

I've seen this clue in the LA Times.
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