Curt, succinct (5)
I believe the answer is:
terse
I believe this is a double definition.
'curt' is the first definition.
(I know that curt can be written as terse)
'succinct' is the second definition.
(I've seen this before)
(Other definitions for terse that I've seen before include "Curt, laconic of speech" , "Brief and to the point" , "Crisp and brief" , "Aphoristic" , "Short and succinct" .)