Crossword Genius

The brotherhood expresses a reservation (5)

Ross

I believe the answer is:

order

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'the brotherhood' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

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(Other definitions for order that I've seen before include "Ruling" , "Regular or proper arrangement" , "Direct or requisition" , "Command, injunction" , "demanding firm discipline" .)

I've seen this clue in The Globe and Mail.
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