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Child
finishing
their
time
at
school,
no
friend
of
EU
(6)
Child finishing their time at school, no friend of EU (6)
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The definition is at the beginning of the clue.
How the clue works
It's a double definition, with nothing hidden: child finishing their time at school is a school leaver, and no friend of EU is the Brexit sense, someone who voted Leave. Both halves are just different meanings of the same word, so no wordplay to untangle.