Crossword Genius

Rogue gets three keys (3)


I believe the answer is:


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'rogue' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for cad that I've seen before include "designing software" , "Dishonourable man of decadent sort" , "Stinker" , "One behaves dishonourably" , "A knave, real rotter" .)

I've seen this clue in The Mirror.
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