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Rome’s landfill, not filled evenly (5-5)

Ross

I believe the answer is:

fifty-fifty

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'evenly' is the definition.
(thesaurus)

I can't explain the rest of the clue.

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(Other definitions for fifty-fifty that I've seen before include "Evenly divided" , "Evens" , "Equally" , "Fairly" .)

I've seen this clue in The Sunday Times.
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