Succinct, sharp (5)
I believe the answer is:
crisp
This clue is a double definition.
'succinct' is the first definition.
(thesaurus)
'sharp' is the second definition.
(I know that sharp can be written as crisp)
(Other definitions for crisp that I've seen before include "Firm - sharp - brittle" , "Potato snack" , "item of junk food" , "food in packet" , "Fresh and bracing" .)