Crossword Genius

In a secretive fashion (2,3,3)

Ross

I believe the answer is:

on the sly

(Other definitions for on the sly that I've seen before include "under cover" , "in private" , "Done in an unpleasant and secret way" , "Under the table" , "Secretly or furtively" .)

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