Willing, after party, for sport (8)

I believe the answer is:

ballgame

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'willing' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'party for sport' is the wordplay.
'party' becomes 'ball' (ball is a kind of party).
'for' is a charade indicator (letters next to each other).
'sport' becomes 'game' (I've seen this before).
'ball'+'game'='BALLGAME'

'after' acts as a link.

Can you help me to learn more?

I've seen this clue in The Daily Express.

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