The brotherhood is clearly not in disarray (5)
I believe the answer is:
order
'the brotherhood' is the definition.
(I've seen this in another clue)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for order that I've seen before include "Class - instruction - book" , "Direct - sequence" , "Command or written direction" , "Directive or society" , "Type of column" .)