Maybe King willing one such as Napoleon ... (4,4)
I believe the answer is:
card game
'one such as napoleon' is the definition.
I can't judge whether this definition defines the answer.
'maybe king willing' is the wordplay.
'maybe king' becomes 'card' (king is a type of playing card).
'willing' becomes 'game' (game can mean willing to do something).
'card'+'game'='CARD GAME'
Can you help me to learn more?
(Other definitions for card game that I've seen before include "Patience for one" , "Poker or whist, say" , "nap perhaps" , "old maid?" , "'Rummy or bridge, say (4,4)'" .)