Crossword Genius

Non-orthodox observance cannot be long-winded (7)

Ross

I believe the answer is:

verbose

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'long-winded' is the definition.
(long-winded can mean overly talkative or verbose)

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

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(Other definitions for verbose that I've seen before include "With an excess of words" , "Garrulous" , "Talkative, given to saying too much" , "Irritatingly long-winded" , "Loquacious" .)

I've seen this clue in the Sydney Morning Herald.
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