Crossword Genius

Compulsory arrangement? (5)

Ross

I believe the answer is:

order

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'arrangement?' is the definition.
(I know that order is a type of association)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for order that I've seen before include "rule of law" , "Tell - regulate" , "demand" , "Tidy state - that's a command" , "Ruling" .)

I've seen this clue in The Irish News and the Evening Standard.
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