Rome ordered extra (4)

I believe the answer is:

'extra' is the definition.
(both can mean additional)

'rome ordered' is the wordplay.
'ordered' is an anagram indicator.
'rome' anagrammed gives 'MORE'.

(Other definitions for more that I've seen before include "To a greater extent" , "Writer" , "Additional or larger amount" , "A greater amount" , "What Oliver wanted" .)

I've seen this clue in The Mirror.

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