Crossword Genius

Itemised a backside, indeed! (8)

Ross

I believe the answer is:

detailed

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'itemised' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

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(Other definitions for detailed that I've seen before include "Meticulous" , "Particular" , "supplying full particulars" , "Giving full particulars" , "Elaborate" .)

I've seen this clue in the Sydney Morning Herald.
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