Crossword Genius

Assembly of what's considered proper (10)

Ross

I believe the answer is:

convention

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'assembly' is the definition.
(convention is a kind of assembly)

I can't explain the remainder of the clue.

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(Other definitions for convention that I've seen before include "assembly" , "See 15" , "See 14" , "Compact" , "normal practice" .)

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