Not strictly in a brusque manner? (7)
I believe the answer is:
roughly
'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.
Can you help me to learn more?
(Other definitions for roughly that I've seen before include "Approximately, more or less" , "Sort of; with violence" , "In the neighbourhood of" .)