Elegant but impudent (5)
I believe the answer is:
smart
This clue is a double definition.
'elegant' is the first definition.
(similar in meaning)
'impudent' is the second definition.
(I know that impudent can be written as smart)
'but' acts as a link.
(Other definitions for smart that I've seen before include "Quick; tidy; sting" , "having chips in" , "Fashionable" , "Bright; sting" , "Rankle; trim" .)