### Clue: All it needs is the board to engage in battle of wits (5,3)
### Answer: CHESS SET 
 ### Explanation: Definition: All it needs is the board to engage in battle of wits 
 Cryptic defn: The battle being a chess game.
I'm not sure of the correctness of the definition.  A chess set already includes a chessboard and hence you don't need a chessboard in addition.