Rogues always seen in suits (6)
I believe the answer is:
knaves
'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)" .)