Smart-looking and in a hurry (7)
I believe the answer is:
dashing
'smart' is the definition.
(thesaurus)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for dashing that I've seen before include "sprinter's talent?" , "Frustrating; debonair" , "Stylish, adventurous" , "sprinting" , "Adventurous, confident" .)