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