Crossword Genius

Knave in cards (4)

Ross

I believe the answer is:

jack

(Other definitions for jack that I've seen before include "bowler rolls it" , "Best Actor Oscar winner 1997, for 'As Good As It Gets'" , "Raising device, socket" , "PANTO (part title)" , "Boy - lifting device" .)

I've seen this clue in The Times and The Sun.
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