Crossword Genius

Not strictly in a brusque manner? (7)

Ross

I believe the answer is:

roughly

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'not' is the definition.
Both the answer and definition are adverbs. Perhaps they are linked in a way I don't understand?

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

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(Other definitions for roughly that I've seen before include "Approximately, more or less" , "Sort of; with violence" , "In the neighbourhood of" .)

I've seen this clue in the Evening Standard.
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