Ordered, as agreed to beforehand (8)

I believe the answer is:

arranged

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'ordered' is the definition.
('arrange' can be a synonym of 'order')

I don't understand the remainder of the clue.

(Other definitions for arranged that I've seen before include "Settled plans for something" , "Ordered" , "Put in order or adapted a piece of music" , "Organised, planned" , "Scored" .)

I've seen this clue in the Evening Standard.

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