Curb level set out in graph (4,5)

I believe the answer is:

bell curve

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'graph' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'curb level set out' is the wordplay.
'set out' indicates anagramming the letters.
'curb'+'level'='curblevel'
'curblevel' with letters rearranged gives 'BELL CURVE'.

'in' is the link.

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I've seen this clue in The Daily Express.

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