In a curt manner (7)
I believe the answer is:
tersely
'in a curt manner' is the definition.
(I know this)
This is all the clue.
(Other definitions for tersely that I've seen before include "In a short and concise manner" , "In an abrupt manner" , "Abruptly" , "In a short or curt manner" , "using few words" .)