18 down
Left
you
to
tidy
up
(7)
Left you to tidy up (7)
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The definition is at the beginning of the clue.
How the clue works
Right, so Left is the definition here — think leftover food, stuff not eaten. For the wordplay, "you" gives you U, then stick NEATEN ("to tidy up") straight after it, and you've built the answer.