10 across
Willing
to
end
court
situation
(4,5)
Willing to end court situation (4,5)
hints
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checks
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The definition is at the end of the clue.
How the clue works
The tennis-court moment is court situation, which is your definition, a game point being that tense stage where one shot could win it. For the wordplay, willing gives GAME (as in "I'm game for that"), and end gives POINT (the tip of something, like a pencil), with "to" simply glueing the two halves together.