More than a day's work for the builders (4)

I believe the answer is:

rome

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'more than a day's work' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

(Other definitions for rome that I've seen before include "European capital" , "Capital city" , "church" , "Spanish Steps city" , "Capital of Italy" .)

I've seen this clue in the Evening Standard.

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