Crossword Genius

Rogues always seen in suits (6)

Ross

I believe the answer is:

knaves

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'rogues' is the definition.
(I know this)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for knaves that I've seen before include "Four face cards bearing a picture of a young prince" , "Scoundrels" , "Loons" , "Jacks (cards)" .)

I've seen this clue in The Irish Independent.
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