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Defender
in
a
game
point
(9)
Defender in a game point (9)
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The definition is at the beginning of the clue.
How the clue works
The definition is Defender — someone who argues a corner. For the wordplay, it's a charade: a (just the letter A), then polo (a game), then gist (the point or essence of something), and stack them all together to get your answer.