Knaves

23 clues
Jacks
Rogues
Varlets
Rascals
Villains
Scalawags
Scoundrels
Tricksters
Blackguards
Rapscallions
Jacks in decks
Jacks, to some
Tricky fellows
Rascally sorts
Dastardly dudes
Jacks in a deck
Jacks, in cards
Deceitful sorts
Dastardly fellows
Playing-card jacks
Untrustworthy types
Top cards at euchre.
Unprincipled fellows
Similar answers:
Aardwolves
Abagofnerves
Abillionlives
Abovesealevel
Abovesuspicion
Abrasives
Absolves
Abundleofnerves
Acaseofhives
Achieves
Achievesuccess
Actives
Activeservice
Additives
Adhesives
Adhesivestrip
Afterlives
Agaves
Aggressivespiel
Aggrieves