15 down
Complicity
in
conflict,
having
change
of
heart
(9)
Complicity in conflict, having change of heart (9)
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The definition is at the beginning of the clue.
How the clue works
The definition is Complicity — secret cooperation. Take the word for conflict, COLLISION, and swap out its central letter (the heart of the word), changing the I to a U, and you've got your answer.