Abrupt in manner (5)
I believe the answer is:
gruff
'abrupt in manner' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for gruff that I've seen before include "Abrupt in manner - rough and low in pitch" , "Churlish" , "Harsh - brusque" , "Surly -- rough-spoken" , "Husky" .)