Possible Clues:

• This could not have been the Knave that stole the tarts nor his weapon
• One might come to blows with the knave in the dark
• Knave of Clubs?
• A card game in which the object is to beat the bank
• That's for blowing
• He may knock one out with spades or clubs
• A pictorial club maybe for a game of cards
• Boycott flag at game of cards
• Flag by the end of gloomy game
• Gambling game